Retro Game Walkthroughs for Doom 3 (PC Games)
Submitted By: ukJames_007
DOOM 3 WALKTHROUGH
Welcome to my Doom 3 walkthrough, I’ve included an overview of the weapons and enemies you’ll encounter throughout Doom 3. I’ve also done a detailed walkthrough up to the first boss at the end of the Alpha labs; I’ll to do the rest later in a separate part because of the size limit for walkthroughs.
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CONTROLS
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W, S, A, D – Move and strafe
Space – Jump
C – Crouch
Z – Zoom
R – Reload
F – Flashlight
Shift – Sprint
Q – Soul cube
1 – Fists
2 – Pistol
3 – Shotgun
4 – Machinegun
5 – Chain-gun
6 – Grenades
7 – Plasma gun
8 – Rocket launcher
9 – BFG
10 – Chainsaw
F1 –vote yes
F2 – vote no
F3 – ready
F5 – quick save
F6 – toggle team
F7 – spectate
F9 – quick load
F2 – screenshot
Mouse button 1 – Shoot/use
Button 2 – Jump
Wheel – switch weapons
Middle button – zoom
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WEAPONS
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FISTS
These are more or less useless and you’re generally more likely to survive running away. They are slow and have a very weak attack. There only good point is that they don’t consume ammo.
CHAINSAW
This is the ultimate melee weapon! Just hold down the fire button and simply let zombies walk into it for an instant death. Despite being extremely entertaining to use the chainsaw should only be used as a last resort (unless against zombies) as while your using it to carve your opponent into bite-size chunks you’re vulnerable to melee attack from the enemy your attacking causing massive damage to you.
PISTOL
Standard Marine sidearm, the pistol is a semi-automatic weapon that can hold up to 12 shots at a time. It is the first weapon you’ll get in the game and is found near the beginning of the game. While not very powerful, the pistol is accurate and very effective against the zombies found early on. It also does not consume much ammo and ammo is very common so you can always rely on it if all else fails to get you out of a sticky situation.
SHOTGUN
The combat shotgun is very powerful at close range but practically useless over a long distance. This can kill almost anything at close range in a couple of shots but over a long distance struggles to kill even basic zombies. The other main downfall of the shotgun is its rate of fire – it’s just so slow and you tend to take a lot of damage while waiting to be able to fire the next shot. It also only holds 8 rounds at a time and takes ages to reload when empty (it seems ages when your been eaten alive by several imps and zombies). However, despite its shortcomings the shotgun is a good weapon which is almost guaranteed to kill anything you aim it at as long as it’s not more than a few metres away.
MACHINEGUN
This is the standard issue marine weapon found throughout the base, it’s powered is comparable to that of the pistol but the machine guns main advantage is its high rate of fire which can kill almost anything before it even gets close. Unfortunately, this means that it eats ammo very quickly and ammo, while common on some levels, is very rare on others. This is best used for taking out fast moving enemies that need eliminating quickly before they can do much damage to you –e.g. pinkies or maggots.
CHAINGUN
The chain gun has an extremely high rate of fire and is slightly more powerful than the machine gun and doesn’t take as long to reload. It’s best for mid to long range and can kill anything in seconds. It takes a second or two before firing after you press down on the fire button which can be annoying and also ammo is scarce for it. This is more useful against more powerful enemies such as commandos and revenants than weaker enemies which are just a waste of ammo to use this against them.
PLASMA GUN
The plasma gun is commonly found later on in the game (it can be found as early as the Alpha labs) and fires the plasma cells found around the base. It has a high rate of fire and overall is very effective against creatures such as imps and pinkies but strangely is not very effective against marine zombies. This is best used on revenants as the plasma is both very effective against the creature itself and can destroy the homing rockets it fires at you. The plasma itself is quite slow moving though making it hard to hit fast moving targets with it.
ROCKET LAUNCHER
The rocket launcher is found later on in the game, its fires rockets at quite a high rate of fire and packs quite a punch. The rocket launcher can bring down almost anything but its best saved for bosses and other tougher enemies.
BFG
This is the ultimate weapon found in Doom 3, while ammo is quite scarce this gun can kill anything you aim it at, often with a single blast. For more powerful enemies you should hold down the fire button or a second or two to fire a more powerful shot. The downside to the BFG is the amount of splash damage caused which can often damage you so it is best used in wide open spaces.
SOUL CUBE
Found in Hell, the soul cube recharges itself from the vanquished enemies its user kills. After 5 demons have been killed it’s ready for use! It kills a single demon and transfers their life-force to you regenerating your health. This makes it very useful in a bad situation and against enemies such as Hell Knights.
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ENEMIES
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REGULAR ZOMBIE
These are the undead scientists and other base personnel, they are the first enemies you come across and pose no real threat to you. They are very slow moving and you always know when there around from distinct noises and groans they make.
The best way to take out lone or groups of 2 or 3 zombies is with the pistol from a distance and aim for the head, this will kill them in about 3-5 shots, the body is easier to aim for but soaks up more ammo.
Later on when you face larger groups of zombies the best way to deal with them is to start by using your pistol then switching to the shotgun when they are close. An alternative to the shotgun if you’re low on ammo is using the chainsaw, while it’s extremely effective, you have to come into very close range of the zombie so you risk taking damage from melee attacks.
FAT ZOMBIE
These are the zombies with bloated abdomens, like regular zombies they are easy to kill and pose no real threat to you, just drop them from a distance with your pistol or at close range with the shotgun.
FIRE ZOMBIES
These are just like zombies except on fire (as the name suggests).
MARINE ZOMBIE
These are the undead forms of your former comrades, strangely, despite being dead; they still remember their combat training and can effectively use weapons and search for cover – looks like they still have some brains after all.
Marine zombies come armed with several weapons including pistols, shotguns, and machineguns. The shotgun ones are especially dangerous and annoying because the blast from their shotguns can cause massive damage at close range and it also knocks you back and puts your aim off giving them time to fire off another round before you have time to recover.
They also wear body armour which can soak up a lot of ammo so for best results aim for the head. Some are even armed with riot shields making body shots practically useless. These are best taken out either at long range with the machine gun or if you’re unlucky enough to come into close contact with one, a shotgun shell to the head or a couple to the body will do the trick.
While they are harder to kill than regular zombies they are very distinct as they are fast moving so you can here them running along the metal floors and they still have functioning radios on them so you can hear radio messages when you come near them.
CHAINSAW ZOMBIES
These are found near the middle of the game onwards, these are the toughest form of zombie in the game and as the name suggests are armed with chainsaws. Fortunatly the chainsaw gives them a very distinct sound and the best way to deal with them is from a distance with the machine gun.
Do not let them get anywhere near you as they have a devastating melee attack which can kill you in a matter of seconds. They are also fast moving so just keep firing your machine gun at them while moving backwards and you’ll be fine.
IMPS
These are the standard demon that you’ll face throughout Doom 3, they have two main attacks. Their long range attack is to throw a ball of plasma at you and at close range they slash you with their claws. Their main danger to you however is their speed, one minute they’ll be standing there hurling plasma at you then all of a sudden they’ll be down on all fours and slashing at you. They can move very fast and have the ability to pounce at you which makes them extra dangerous.
Fortunatly they are quite weak and about 12 machinegun bullets can drop them from a distance or 2 shotgun shells at close range (or one in the head). While generally not dangerous on there own, they are deadly in numbers or when you’re low on health.
MAGGOT
These are the two headed monsters that you come across; these are similar to imps and move very quickly so the best way to bring them down is with a shogun from close range. They are fast but easy to kill.
WRAITH
Again, these are similar to imps, except without the ability to shoot balls of plasma and the ability to teleport short distances, like the imps though they are relatively weak and can be killed easily with a shotgun blast from close range.
PINKY
These are robotic dog type creatures that are found in the first half of the game. They are very fast moving and attack by biting you which can cause massive damage to you. Plasma is a very effective weapon to use against them against them but if you don’t yet have the plasma gun, use the machine gun and just keep firing at it while retreating from it to bring it down. If you’re feeling brave a couple of shotgun rounds to the head will also do the trick.
TRITE
These are the spiders that look like upside-down human heads. They come out of small openings and from places like air ducts and are always found in large numbers. While a single trite poses no real threat to you, they are deadly in numbers and can be hard to hit. The best way to take care of small numbers of them is with a single shotgun blast and use the chain gun or machine gun for larger groups of them.
TICK
These are very similar to Trites only these are slightly more powerful and can take a bit more damage.
LOST SOUL
These are the flaming heads that are seen flying around, these are often found in groups and, while individually are not hard to kill; they can be a problem when you face a lot of them at once. The best way to take them out is with something like the machine gun which can dispatch them quickly and from a distance.
CACODEMON
These are like the lost souls only bigger, they float around the levels often on their own or in pairs and shoot lightning at you. They are also quite hard to hit because of their speed and can take quite a lot of damage. The best way to kill them is again with the machine gun or chain gun, don’t use the plasma gun as they are hard to hit with it although the shotgun is very effective if you are unfortunate enough to come into close range of one.
REVENANT
These demons are particularly nasty; these are the armour wearing skeletons armed with rocket launchers first seen about half way through the game. The homing rockets they fire make them extremely dangerous and they can take a lot of damage. Revenants can be taken down with a couple of shotgun blasts from close range but the best way to deal with them is from a distance with the plasma gun, the plasma is both extremely effective against the revenant and it destroys the rockets it fires at you.
COMMANDO
These come in two forms – regular and chain gun commandos. The regular ones are the ones you meet first; they are fast moving you and attack you with the tentacle on their right arm. While they can take a lot of sustained machinegun fire, a couple of shotgun blasts from close range as always, is enough to kill them.
The commandos armed with chain guns are much tougher though. While they can take no more damage, their chain gun can cause a lot of damage to you and also knocks your aim off target. This can make killing these extremely difficult and the soul cube is ideally suited to killing demons such as these.
CHERUB
These are the evil half baby, half demon creatures which are extremely nasty and hard to kill. While a single shotgun blast from close range is enough to kill them, their speed makes them incredibly hard to hit and they also have a powerful attack.
MANCUBUS
You face three of these in the Recycling Sector level; these are very powerful and hurl fireballs at you. To kill them simply throw everything you’ve got at them and don’t attack them from close range as you won’t last long.
ARCH-VILE
These demons can summon other demons to attack you as well as being armed with fireballs which it shoots at you. The best way to take out Arch-viles is with the soul cube or BFG.
HELL KNIGHT
Hell knights are like giant imps only much more powerful with a fireball attack that can cause serious damage to you; again these should be dealt with by using either the soul cube or the BFG. These are first found in Hell where they can be extremely difficult to kill but later one use the soul cube to quickly kill them.
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WALKTHROUGH
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MARS CITY
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Head up the stairs and up the ramp in front of you and go in the door and stand on one of the scanning pads on the floor. When the scan is complete go through the door and then through the next door in front of you.
During the cutscene you’ll receive your PDA and be told to report immediately to Marine command. Take a right and go up the stairs and follow the path until another cutscene starts. Go left again and go straight past the kitchen and through the next doors.
Go through the door on the right and go right at the Marine and then through the door labelled ‘Marine Command’.
After the next cutscene follow the sentry bot to find your gear, when the bot deactivates itself, walk down the stairs and open the cabinet with the code ‘396’, then enter the lift and go to the substation.
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MARS CITY UNDERGROUND
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Exit the lift, approach the marine behind the glass, then take the body armour and pistol from the locker on your left and head out through the door. Walk across the walkway and down the stairs, then through the next door. Keep following this path until you come to an opening on the left with a cabinet in it, collect the PDA from the table and open the locker with the code ‘531’ to get some more armour and a medipack.
Again keep following the set path until you come to the scientist working on a machine, here go right through the door and when the lights go out, press ‘F’ to select your flashlight and continue down the stairs.
Go down into the garage area and take the pistol by the marine then enter the airlock. Activate the airlock and when the doors open sprint across the bridge and into the airlock on the other side.
In the next room, enter the lift and take it up to the communications level. Now just follow the path until a cutscene kicks in and the invasion begins. Shoot the scientist when he turns into a zombie and turn around and shoot the marine zombie that appears through the door behind you.
Head through the door and shoot the zombie in the next room and go straight through the lift on the other side and take it to ‘surface access’. Go back through this area and back through the airlock to the garage area. When the doors open, shoot the zombie to your right and go up the stairs and through the next door.
Watch out for the zombie armed with a wrench that appears as soon as you open the door so dispose of him with a couple of shots to the head then continue retracing your steps through the next area. When you get to the bridge the scientist as working on earlier use the control pad to extend it then use it to get across and shoot the marine zombie that appears from the darkened area to the left of you.
Go through the door in front of you and shoot another zombie marine, then go down the stairs to your right and head toward the far left corner of the room where a zombie appears from a small opening in the wall. Take the PDA from the desk and use it to get through the locked doors on the opposite side of the room.
Watch the scientist fall to his death then go to the end of the room and shoot the zombie to the right before going through the doors to the left.
Collect the shotgun and armour from the crate below then shoot the 3 zombies on the lower level you come to. Climb back up using the ladder and go through the door at the other end of the hallway. When the lights go out, shoot the zombie that appears from the stairs. Go up those stairs and take out the zombie and marine zombie at the top.
Walk forward and when you hear a strange noise turn around and kill the zombie that’s advancing on you then shoot the second one behind you. Collect the ammo from the shelf at the far side of the room then continue through the door and through the next door to the right.
Shoot the imp with your shotgun and shoot the second one that appears when you advance further into the room. Switch back to your pistol and kill the zombie to your left in the darkened area.
Go down the stairs and quickly shoot the zombie that appears from the darkened area then quickly turn round and equip your shotgun to deal with the imp that appears from behind you. Go through the door and straight through the next one
Heal yourself at the health station and shoot the imp that appears when you go down the stairs. Continue through this room and kill the zombie that appears from the darkened area to your left then continue through the next door.
In the next room, take a right and go through the next door and straight through the next area. Watch out for the imp that leaps at you when you go through the next door. As you enter this room a zombie marine appears behind you so dispatch him quickly and search the room for goodies.
In front of you can hear a worker screaming, then an imp appears so deal with it and exit through the door at the end of the room. Go straight through the next room ignoring the dead body hanging in front of you. Approach the stairs in the next area and an imp appears from under them and smashes them. Kill the imp and go up the stairs.
In the next area an imp appears next to some explosive barrels – I think you know what to do! Then head back up the stairs avoiding the falling crates and exit through the door at the top dealing a swift shotgun shell to the head of the imp that appears. Approach the dead marine and shoot him when he gets up. Next use the control panel behind you and leave via the lift that the control panel unlocks the door to.
When you leave the control room you’ll have to deal with another marine zombie, an imp next to the lift and another marine zombie in the lift. Enter the lift and take it back to Mars City.
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MARS CITY
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Exit the lift and shoot the zombie marine that appears from behind the crates, go left and approach the maintenance ladder to the left by the storage lockers. A worker tells you to get up to his position. When the ladder drops down, climb up it and talk to the worker at the top.
He tells you to go for help so exit through the shafts on the opposite wall. When you come to the first junction, go left and get the armour from the opening then go right down the 3 pipes and drop down at the end.
Enter the lab in front of you, when you hear a zombie groaning turn around and kill the zombie behind you and the one that appears from the left. Collect the PDA from the desk in front of you then crouch under the flames and exit through the door on your left.
When you here the radio chatter get ready as two zombie marines appears through the doorway to the right. One is armed with a shotgun and the other is armed with a machinegun. When they are both dead go through the door they came through and search the area to the left in the next room. In imp jumps at the window but it can’t get in. The room contains a key-card, 2 clips and a medipack.
Go back though the door and use the key-card on the door at the opposite side of the area. As you enter the next room, a marine zombie armed with a pistol appears so shoot him, advance a bit further and another one appears. If you look through the windows here you can see a sentry bot taking care of several more marines. When it’s clear go through the door to your right and then through the door to the left.
When you enter the next room the lights dim and two zombies appear in the room and another one behind you. Quickly kill them with the shotgun and enter the room in front of you. To the left there is some armour and a clip, collect them and another zombie appears in the room. Take care of him and collect the shells at the opposite wall and go through the door.
Listen to the conversation and when they’ve all been killed, collect the pickups and follow the corridor. When the flaming zombie appears, shoot it with the shotgun. Enter the next room and take out the marine zombie that appears from behind the tanks. To avoid damage while taking him out you can take cover behind the door with your shotgun equipped; eventually the zombie will come looking for you so you can just blast him the minute he appears. To the right of the gas tanks there is another marine zombie. Go behind the tanks and collect the armour there, an imp and a zombie appear behind you so kill them with a couple of shotgun blasts.
Go right and when you approach the doors an imp drops from the ceiling, blast it with several shotgun shells while moving backwards to kill it. First enter the room to the right and collect the ammo there then enter the infirmary.
Heal at the health station and collect the PDA from the table, open the locker with the code ‘347’. Go through the door and shoot the zombie that gets up off the operating table. Continue through to the next corridor where another flaming zombie appears from the shadows.
Shoot the zombie and go right and kill the zombie that’s just killed the marine, continue to the area with all the dead marines and approach the computer that’s saying ‘video linkup requested’. After the video you get new objectives to meet up with Bravo team.
Enter the combat prep room behind you and use the code ‘584’ to enter, stock up on ammo before going back to the corridor where you saw the zombie killing the marine and take the first left. Your new clearance will allow you to enter the restricted area. Switch to the machine gun and shoot the two zombie marines that appear. Go through the door to the left and kill the two zombie marines that appear in front of you. Turn around and kill the marine zombie and regular zombie that appear behind you then enter the kitchen.
Kill the zombie in the darkened area, enter the darkened area and kill the zombie marine that appears behind you. Collect the bullets the marine drops and exit the kitchen and go left.
Enter the toilets in front of you and search them for health. Then approach the mirror and when the vision is over switch to the shotgun and kill the imp that comes through the door. Go back through the door and go left into the next area, avoid the marine zombie that appears and let the sentry bot deal with him.
Follow the sentry bot through the corridor and let it deal with any enemies that appear. In the next room, there will be several zombies whom the bot takes care of, when the bot goes left; go down the stairs as there is some ammo in the area below.
Watch out in the next room as a marine zombie appears out from behind a pillar, the bot will again take care of him. You will now get a radio message telling you to get to bravo team as quickly as possible. Continue following the bot until it deactivates itself in the next area. This area contains two imps (the bot may have killed one of them already) so equip your machine gun and kill the other one.
In the far right hand corner of the room, there is a small air duct, enter it and go up the ladder to the next floor, up here you will find some shells, health, and ammo as well as another PDA which is found next to the dead scientist. Go back to the ground floor and take the lift to Administration.
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UAC ADMINISTRATION
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Exit the lift and after the cutscene shoot the zombie marine that appears from the door on the left. Collect the armour and health around the room and go up the steps on the left and approach he body sat on the bench, shoot it when it gets up and continue through the doors.
Once in the corridor, walk forwards until a roof panel falls down and move backwards to avoid the imp, take cover by the doorway and shoot it when it appears. There is also a marine zombie around the next corner and another one appears when you kill the first one.
Enter the office and collect the PDA and video disk from the desk on the front, go to the cabinet and shoot the zombie in the dark area to the right, next open the storage locker with the code ‘586’. When locker contains some armour and grenades and in the dark area where the zombie was there are some shotgun shells.
Exit the office and go through the door to the alpha labs. As soon as the door opens an imp pounces at you so kill it with a shotgun blast. In the next room, avoid the fireball from the imp behind the machine as it runs of before you can shoot it. Go through the next door and avoid the barrels that are being thrown at you by the zombie on the walkway above.
Go left in this area then talk to the injured marine. Try to open the doors to the Alpha labs but they are locked and you’ll get a new objective to get the PDA of William Banks in order to get clearance.
Retrace your steps through the last two rooms and shoot the imp that’s appeared to the left in the third. Continue retracing your steps to the room you started in and two imps destroy the damaged door in front of you, kill the imps and go through the newly opened door.
In the next room, the lights go out and an imp appears on the roof and climbs down the wall, shoot it and the one that appears behind you. Go through the next door, in here a zombie marine appears to your left. Collect the ammo and health in the area in front of you then continue along the corridor where there is another zombie marine, and go through the next door.
Go into the room behind the glass on the right and use the computer to override the security, equip your shotgun here and when the pinky bursts in unload several shells in its face. Exit the room through the smashed glass and shoot the imp that appears next to the now unlocked doors. When the imp is dead go through the door that you’ve just unlocked.
Go up the stairs and at the top a panel in the wall opens and a pinky appears, immediately sprint backwards while firing at it to avoid taking damage then kill the marine zombie that appears behind it. Go to the end of the corridor and an imp appears on the stairs you just came up.
Enter the room on the left and get the health and the PDA, then open the locker with the code ‘0508’ to get some armour and the chain-gun. Exit the area through the corridor on the opposite side near where the pinky appeared.
When you get to the walkway where the first pinky appeared, you get a radio message telling you that there is a sort of growth taking over parts of the base. Continue following this path.
Enter the next door you come to and advance into the room it leads to, when you get about halfway across a panel in the wall behind you opens and an imp attacks you from behind.
Go through the door to the executive offices and listen to the conversation below, through the next door there is a marine zombie that attacks you from the left and a regular zombie that’s walking around the room. There is some armour near where the marine zombie was in a small opening. Next enter the room with the pentagram on the floor and the growth on the walls.
Collect the PDA from one of the scientists and shoot the imp that spawns in the centre of the room and then shoot the one that appears outside. Exit the room and go left, another imp spawns, kill it then enter the room on the left to get some armour. Go left out of the door with your shotgun equipped and shoot the imp that appears right in front of you.
Go straight through the next door and down the stairs, there is a regular zombie at the bottom but he shouldn’t cause you any trouble. In the reception area, go left through the doors to the Alpha labs. In the next room the lights go out for a moment and two zombie marines appear in front of you.
Enter the office on the right and open the locked door with your newly acquired clearance. When you come to the ladder on the left, ignore it and instead go right through the door and collect the PDA and grenades from the next room.
Go back to the office you were just in and approach the doors to the Alpha labs, as you approach an imp spawns near you so kill it then go through the doors. Go through the next few rooms to get to the area you where in before and use the controls by the door to get access the labs.
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ALPHA LABS – SECTOR 1
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Use the button on the right to open the doors and exit the lift. Go behind the desk on the left and when the room darkens and you hear the evil voice equip your shotgun and shoot the four zombies that appear from the left. They are quite difficult to spot since the room is so dark, so stand in the middle of the room with your shotgun and use the torch to spot the zombies – wait for them to get close and then quickly switch back to the shogun and take them out with a swift shot to the head, repeat this process. If you take some damage then there is some health on one of the seats on the left and there is a health station on the far right near where the zombies appeared.
Go behind the desk again and use the computer to unlock the door, now go through the newly unlocked door. There is a marine zombie patrolling in this next room and another one behind the crates on the left side, once you’ve taken care of them go right where you’ll face a regular zombie then go through the next door.
You’ll be instantly attacked by an imp and then by two marine zombies that come through the door in front of you. Jump through the smashed windows to your right and an imp spawns to your right and one to your left.
Open the storage locker on the other side of the area with the code ‘752’. Enter the control room next to the locker and kill the marine zombie inside, the screen then goes red and a regular zombie appears from the shadows and an imp just outside the door. Collect the video disk and PDA from the desk and exit through the other door – watch out for the imp on the right.
Use the computer to open the maintenance access to the laser shaft and take care of the zombie marine on the opposite side of the room. Crouch and enter the shaft and go to the end and on the right use the controls above the air duct then enter it when it opens. There is a zombie marine patrolling in the area it leads to so eliminate him when he walks past before entering the next room.
Go left and shoot the zombie you see then take the stairs right, on the right there is some armour and another zombie then go through the door to the left. In the corridor you find yourself in, to the left is a health pack then go to the right. Around the corner an imp appears from the right then the room darkens and there is another evil laugh, move down the stairs and kill the zombies – one appears from behind the pillar in front of you and the other two from the right.
The corridor behind the door on the left is blocked off by fire but you can get some armour and shotgun shells off the dead marine there then take the path to the right. In the next area you get attacked by three zombies – 2 from in front and one from behind. Search the area for some shells and a medipack which are both guarded by a zombie then head up the stairs.
There is a zombie to the left but go to the right and collect the ammo and PDA from the desk. Next use the computer to stop the fire. Backtrack to where you found the dead marine in the corridor that was cut off by the fire from the way you came until a cutscene starts. On your way there you’ll come across a couple of zombie marines and an imp but nothing you shouldn’t be able to handle. The cutscene shows a maggot crawling out of a vent, these are just like the imps except without the ability to throw plasma balls at you and can be killed just as easily. There are four in total and once they’re dead a floor panel is lifted up off the ground.
Jump into the vent and follow it and take the first turning on the left, climb out here and two zombies appear in front of you. Go left at the far corner and through the door at the end. Shoot the explosive barrels in here to kill the zombie marine and go right through the next door and kill another zombie marine on the other side.
Go up the stairs at the end and kill the maggot and the zombie marine that appear when you approach the door. Collect the goodies you find and continue through the door. Go straight up the stairs to the left and there are some armour shards on the floor in front of you. If you try to pick them up a wall panel opens and an imp jumps out at you.
Go up the night set of steps and through the door at the top, in front of you there is a dead marine so pick up the ammo he has dropped then continue right. In here your vision goes red again and two imps spawn in at opposite sides of the room, swiftly give them each a shotgun blast to the head. On one of the blue pillars in the middle there is a switch, use it to lift up the glass allowing you to get to the shotgun shells behind.
Continue through to the next area, in her there is a zombie in the darkened area to the left and a video disk on the desk in front of you. Go through the door on the left and shoot the maggot to the left. There is a zombie by the desk to the right, approach the desk and a wall panel opens on the right revealing an imp. Shoot it and then use the computer in front of you.
Enter the newly opened area where the imp appeared and climb up the ladder to the right. Go straight through this room and approach the scientist in the lab. Wait for the Hydrocon machine behind him to lift up then run through and collect the dead scientists PDA from his body on the right. There is some health and armour around the corner to the left, collect it if you need to then drop down the hole in the floor and unlock the previously locked door.
In here there are 2 zombies, a normal one and a marine one, eliminate them both and if you take damage collect the health near the right wall before exiting through the next door.
In here you get attacked by 2 maggots, kill them and kill the maggot in the room opposite. Take the door on the right in the next hallway. When you go through the next door a maggot appears from the floor and a marine zombie behind you. If climb into the hole that the maggot appeared from there is some armour and a clip.
In the next room there are 4 maggots that attack from all directions, in this room there are some shells, armour and health to be found. When your done enter the lift and take it down to sector 2.
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ALPHA LABS - SECTOR 2
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Exit the lift and go right, when you see the body being lifted up and carried away by an unknown force, 2 imps teleport in. Go through the same door that the body was carried through and go in to the toilets on the right. Just as you enter there is a zombie to your left and two more that appear when you enter the room. When the zombies are dead a maggot appears. Climb up the ladder in the far corner.
Crouch and enter the air ducts, you can take the first right to find some ammo and health guarded by a maggot; otherwise continue one to the end. There are two imps in the corridor you drop into. Go right and enter the room on your right and shoot the two zombies in here and collect the PDA of the desk.
Exit this room and then go through the next two double doors, in this corridor there is a maggot and an imp. Quickly kill them as the room has one of its windows smashed making the area a vacuum. Sprint through the next doors, on the walkway to the left an imp appears and also a zombie marine that comes through the next double doors.
Go straight through the next two rooms and when you get to the main compressor area a maggot teleports in and 2 zombie marines from the corridor you where just in. There is a video disc by the computer on the right then go through the next door. In were there are two zombie marines and an imp, you’ll probably take quite a lot of damage while battling them but fortunately there are several health pick-ups around the room. Also a wall panel falls down revealing some ammo.
Get onto the lift and take it to the lower level. While you are on the lift, an imp and a maggot climb down the shaft after you so try and take them out while they are climbing as then they can’t attack you. Behind the crates there is a health pack and some armour shards then go through the door in front of you.
Approach the scientist in this room, he tells you he’ll lead you through the next area if you help him get of the base. Follow him into the darkened room, eventually you are attacked by an imp so quickly shoot it with your weapon of choice then return to the scientist. Just before you go down some steps in this room, to the left is a health pack in a dark corner.
When you come to a T-junction an imp appears from the right and in the next area there is another imp after the EMP wave that disables your torch for a couple of seconds. In the next room there is a maggot on your left. In the final room with the ladder in the centre, the room goes dark and you unable to use your torch for a second or two. An imp appears from the left and the scientist dies no matter what you do to save him. Next simply climb up the ladder to proceed to the next area.
Behind you at the top of the ladder there is a storage locker, open it with the code ‘102’, it contains some armour and two clips. Then go through the next door and climb over the pipes and onto the floor. On the right near the locked door there is some health, then crawl through the air duct and follow it until you can get out at the end. Make your way through the next shaft and kill the Trite in the room at the end of them.
Use the panel in front of you to extend the ladder and then kill the Trites that appear. Once they’re all dead grad the health and armour from the left side of the room then climb up the ladder where there are another three Trites. Kill them then go through the door on the left and use the panel to travel to sector 3.
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ALPHA LABS – SECTOR 3
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Just as you exit the lift you will be attacked by a zombie marine and an imp so crouch by the crates and take them both out with the shotgun when they approach you to avoid taking damage. Around the next corner there are two more zombie marines and another imp.
Clear the maggot and the trites out the area to the left as you go up the steps then enter the room on the right. When you enter this room you’ll here the now familiar sound of a zombie marine behind you so kill it then take the PDA from the desk.
You now have to transfer the toxic barrels into the incinerator, to do this you must use the controls in front of you to direct the crane over the barrels, pick them up, then move it over the incinerator and drop it in then repeat this process.
When both barrels have been destroyed you get a message from Sgt Kelly and a new objective to locate the entrance to sector 4. Exit the room and go right where there is a maggot along with several trites. Then enter the waste incinerator on the right. Collect the key from the centre of the room and go through the door in front of you, collect the PDA from next to the storage locker and open the locker with the code 123. If you raise the platform then you have to face two zombie marines, kill them by shooting the explosive barrels around them, then collect the armour they drop. Then backtrack to where you killed the maggot and trites at the beginning of the level and use he key to open the locked door, you’ll face four zombie marines on the way there.
There are several enemies in here including trites, a marine an imp and a maggot. Open the locker on the left with the code ‘123’. You can jump down onto the pipes below the stairs to find some health and ammo. In the next room there is a zombie marine and an imp.
Approach the locked door on the right and you will be attacked by trites and a zombie marine will come through the door unlocking it. Kill them all then go through the now unlocked door. There are two zombies in here, one that appears from the left and the one standing in front of you which attacks you when you approach it.
Go left here and collect the chain gun from the centre of the next room, this causes a wall panel to lift up revealing some armour, collect the armour and you’ll be sealed in and when the panel opens you’ll be greeted by an imp and three zombies. Blast your way back down the corridor to the area you where in before.
Take the door on the right and kill the zombie and the trites in here then take the lift down. Kill the imps and maggots that appear down here. Enter the next room and kill the two Pinkys in here then approach the locked door. This causes an imp to appear behind you. Kill it then approach the door again, the window next to it is smashed so climb though it and open the locker on the right with the code ‘123’. Go through the door on the left and travel to sector 4.
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ALPHA LABS – SECTOR 4
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Collect the bullets from the desk next to the computer then go left through the door. Approach the control panel by the windows in the centre of the room and either free the scientist by opening the chamber or kill him by activating it. Take the door on the other side of the room and take the lift down and talk to the scientist at the bottom (if you saved him). Follow him into the office and collect the PDA and video disk, use the computer to the right of the scientist to open the locker containing the weapons, and then leave the room.
Go through the other door and again through the next two. When you open the second door an imp pounces out at you with a zombie marine following it. There is another two zombie marines that needs to be dealt with on the walkway in front of you. Walk into the room and kill the trites that appears.
If you need health, there are two health packs on the right hand side of this room, and then go up the stairs in the far left corner. There are three more zombie marines up here; one of them appears on your left and the other two on the other side of the walkway who can be easily killed by shooting the explosive barrel.
Once the zombies are dead, trites appear from an opening in the wall and from down below which follow you up the stairs, the ones below can be killed easily by throwing grenades down the stairs. Go through the door directly in front of you and collect the PDA from the computer on the right. You go down the ladder on your right and explore the area below, it contains some pickups and some imps.
You now have a choice of doing two things here:-
1 –activating the EFR system
2 –extend the service bridge
Activating the EFR system is quicker and generally easier (and brighter!) although you have to make a few tricky jumps. If you extend the bridge you’ll face more monsters (in the dark since the lights don’t come on) but I prefer it since you can find a plasma gun this way which is useful against the boss.
If you activate the EFR system:-
Use the machine that activates as a bridge and do two running jumps to get across. When you get to the rotating bridge, wait for it to face you then run and jump onto it and get of at the unlocked door on the right.
Enter this room and two maggot’s teleport in, kill them then use the computer to start EFR processing. Exit the room, kill the maggot that appears and get back on the bridge and go to the other door which is now unlocked.
Go through the door, there is a zombie marine to your left then jump on the moving platform. Now simply avoid the various pieces of machinery, there is a small opening on the left, you can jump off here to get some armour shards then simply jump onto the next platform.
When you get off at the end, go through the door and kill the imp and a couple of trites on the left, then go to the computer terminal below and initiate the magnetic field. Now go back up the steps and jump across the two generators avoiding the rotating arms.
Kill the two imps on the other side and use the panel on the right to pen the storage area. Now leave via the door and jump onto the moving platform, get off where the zombie marines are, kill them and search the area for pick ups then go through the door at the end. Kill the zombie marine in here then continue through to the area with several dead marines in it.
If you activate the service bridge:-
Two zombie marines come through the door behind you. Kill them then cross the two bridges and go through the door at the end. As you approach it a zombie marine comes through it. Kill the trites in the next area then go left through the next door. Kill some more zombie marines in here and collect the ammo. As you approach the door a maggot spawns in at the other side of the room.
Go through the door and cross the bridge, a wall panel opens revealing an imp and a ladder. Kill the imp and climb the ladder and shoot the maggot at the top. Now follow the passageway killing the maggots and trites. Climb down the ladder at the bottom. A wall panel opens on the left, enter the area it reveals and go right where the wall lifts up, now follow this passage to a room containing the plasma gun. When you collect it you’ll have to battle several imps and there are some zombie marines waiting for you near the ladder you just came down.
Cross the bridge and kill the trite and maggot in the next room, there is some armour in the darkened corner near where the trite appeared from, and then climb the ladder.
Kill the marine zombie that comes through the door then open the locker with the code ‘651’. Go through the next door, cross the bridge and in the next room, kill the trites that are under the stairs, there are loads of them so use the plasma gun here. You will probably take damage, behind the stairs there are some armour shards and some health.
Go through the next door and kill the three zombie marines across the bridge. Go right up the steps and through the door at the top, shoo the zombie marine in here then continue through the next few rooms until you come to a room with several dead marines in it.
The two different sections end here for the boss battle.
Stock up on health and ammo here and go through the door to face the boss.
To kill the boss simply equip something like the chain gun (the plasma gun is quite effective) and strafe while shooting, avoid being trapped into a corner and keep moving and the boss will be killed quickly and relatively easily. Now enter the unlocked door and travel to the Enpro facility.
Thanks for reading! I hope this walkthrough has been of some use to you.
This walkthrough was written by me so please don’t copy it or post it on any other sites without my permission.
Welcome to my Doom 3 walkthrough, I’ve included an overview of the weapons and enemies you’ll encounter throughout Doom 3. I’ve also done a detailed walkthrough up to the first boss at the end of the Alpha labs; I’ll to do the rest later in a separate part because of the size limit for walkthroughs.
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CONTROLS
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W, S, A, D – Move and strafe
Space – Jump
C – Crouch
Z – Zoom
R – Reload
F – Flashlight
Shift – Sprint
Q – Soul cube
1 – Fists
2 – Pistol
3 – Shotgun
4 – Machinegun
5 – Chain-gun
6 – Grenades
7 – Plasma gun
8 – Rocket launcher
9 – BFG
10 – Chainsaw
F1 –vote yes
F2 – vote no
F3 – ready
F5 – quick save
F6 – toggle team
F7 – spectate
F9 – quick load
F2 – screenshot
Mouse button 1 – Shoot/use
Button 2 – Jump
Wheel – switch weapons
Middle button – zoom
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WEAPONS
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FISTS
These are more or less useless and you’re generally more likely to survive running away. They are slow and have a very weak attack. There only good point is that they don’t consume ammo.
CHAINSAW
This is the ultimate melee weapon! Just hold down the fire button and simply let zombies walk into it for an instant death. Despite being extremely entertaining to use the chainsaw should only be used as a last resort (unless against zombies) as while your using it to carve your opponent into bite-size chunks you’re vulnerable to melee attack from the enemy your attacking causing massive damage to you.
PISTOL
Standard Marine sidearm, the pistol is a semi-automatic weapon that can hold up to 12 shots at a time. It is the first weapon you’ll get in the game and is found near the beginning of the game. While not very powerful, the pistol is accurate and very effective against the zombies found early on. It also does not consume much ammo and ammo is very common so you can always rely on it if all else fails to get you out of a sticky situation.
SHOTGUN
The combat shotgun is very powerful at close range but practically useless over a long distance. This can kill almost anything at close range in a couple of shots but over a long distance struggles to kill even basic zombies. The other main downfall of the shotgun is its rate of fire – it’s just so slow and you tend to take a lot of damage while waiting to be able to fire the next shot. It also only holds 8 rounds at a time and takes ages to reload when empty (it seems ages when your been eaten alive by several imps and zombies). However, despite its shortcomings the shotgun is a good weapon which is almost guaranteed to kill anything you aim it at as long as it’s not more than a few metres away.
MACHINEGUN
This is the standard issue marine weapon found throughout the base, it’s powered is comparable to that of the pistol but the machine guns main advantage is its high rate of fire which can kill almost anything before it even gets close. Unfortunately, this means that it eats ammo very quickly and ammo, while common on some levels, is very rare on others. This is best used for taking out fast moving enemies that need eliminating quickly before they can do much damage to you –e.g. pinkies or maggots.
CHAINGUN
The chain gun has an extremely high rate of fire and is slightly more powerful than the machine gun and doesn’t take as long to reload. It’s best for mid to long range and can kill anything in seconds. It takes a second or two before firing after you press down on the fire button which can be annoying and also ammo is scarce for it. This is more useful against more powerful enemies such as commandos and revenants than weaker enemies which are just a waste of ammo to use this against them.
PLASMA GUN
The plasma gun is commonly found later on in the game (it can be found as early as the Alpha labs) and fires the plasma cells found around the base. It has a high rate of fire and overall is very effective against creatures such as imps and pinkies but strangely is not very effective against marine zombies. This is best used on revenants as the plasma is both very effective against the creature itself and can destroy the homing rockets it fires at you. The plasma itself is quite slow moving though making it hard to hit fast moving targets with it.
ROCKET LAUNCHER
The rocket launcher is found later on in the game, its fires rockets at quite a high rate of fire and packs quite a punch. The rocket launcher can bring down almost anything but its best saved for bosses and other tougher enemies.
BFG
This is the ultimate weapon found in Doom 3, while ammo is quite scarce this gun can kill anything you aim it at, often with a single blast. For more powerful enemies you should hold down the fire button or a second or two to fire a more powerful shot. The downside to the BFG is the amount of splash damage caused which can often damage you so it is best used in wide open spaces.
SOUL CUBE
Found in Hell, the soul cube recharges itself from the vanquished enemies its user kills. After 5 demons have been killed it’s ready for use! It kills a single demon and transfers their life-force to you regenerating your health. This makes it very useful in a bad situation and against enemies such as Hell Knights.
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ENEMIES
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REGULAR ZOMBIE
These are the undead scientists and other base personnel, they are the first enemies you come across and pose no real threat to you. They are very slow moving and you always know when there around from distinct noises and groans they make.
The best way to take out lone or groups of 2 or 3 zombies is with the pistol from a distance and aim for the head, this will kill them in about 3-5 shots, the body is easier to aim for but soaks up more ammo.
Later on when you face larger groups of zombies the best way to deal with them is to start by using your pistol then switching to the shotgun when they are close. An alternative to the shotgun if you’re low on ammo is using the chainsaw, while it’s extremely effective, you have to come into very close range of the zombie so you risk taking damage from melee attacks.
FAT ZOMBIE
These are the zombies with bloated abdomens, like regular zombies they are easy to kill and pose no real threat to you, just drop them from a distance with your pistol or at close range with the shotgun.
FIRE ZOMBIES
These are just like zombies except on fire (as the name suggests).
MARINE ZOMBIE
These are the undead forms of your former comrades, strangely, despite being dead; they still remember their combat training and can effectively use weapons and search for cover – looks like they still have some brains after all.
Marine zombies come armed with several weapons including pistols, shotguns, and machineguns. The shotgun ones are especially dangerous and annoying because the blast from their shotguns can cause massive damage at close range and it also knocks you back and puts your aim off giving them time to fire off another round before you have time to recover.
They also wear body armour which can soak up a lot of ammo so for best results aim for the head. Some are even armed with riot shields making body shots practically useless. These are best taken out either at long range with the machine gun or if you’re unlucky enough to come into close contact with one, a shotgun shell to the head or a couple to the body will do the trick.
While they are harder to kill than regular zombies they are very distinct as they are fast moving so you can here them running along the metal floors and they still have functioning radios on them so you can hear radio messages when you come near them.
CHAINSAW ZOMBIES
These are found near the middle of the game onwards, these are the toughest form of zombie in the game and as the name suggests are armed with chainsaws. Fortunatly the chainsaw gives them a very distinct sound and the best way to deal with them is from a distance with the machine gun.
Do not let them get anywhere near you as they have a devastating melee attack which can kill you in a matter of seconds. They are also fast moving so just keep firing your machine gun at them while moving backwards and you’ll be fine.
IMPS
These are the standard demon that you’ll face throughout Doom 3, they have two main attacks. Their long range attack is to throw a ball of plasma at you and at close range they slash you with their claws. Their main danger to you however is their speed, one minute they’ll be standing there hurling plasma at you then all of a sudden they’ll be down on all fours and slashing at you. They can move very fast and have the ability to pounce at you which makes them extra dangerous.
Fortunatly they are quite weak and about 12 machinegun bullets can drop them from a distance or 2 shotgun shells at close range (or one in the head). While generally not dangerous on there own, they are deadly in numbers or when you’re low on health.
MAGGOT
These are the two headed monsters that you come across; these are similar to imps and move very quickly so the best way to bring them down is with a shogun from close range. They are fast but easy to kill.
WRAITH
Again, these are similar to imps, except without the ability to shoot balls of plasma and the ability to teleport short distances, like the imps though they are relatively weak and can be killed easily with a shotgun blast from close range.
PINKY
These are robotic dog type creatures that are found in the first half of the game. They are very fast moving and attack by biting you which can cause massive damage to you. Plasma is a very effective weapon to use against them against them but if you don’t yet have the plasma gun, use the machine gun and just keep firing at it while retreating from it to bring it down. If you’re feeling brave a couple of shotgun rounds to the head will also do the trick.
TRITE
These are the spiders that look like upside-down human heads. They come out of small openings and from places like air ducts and are always found in large numbers. While a single trite poses no real threat to you, they are deadly in numbers and can be hard to hit. The best way to take care of small numbers of them is with a single shotgun blast and use the chain gun or machine gun for larger groups of them.
TICK
These are very similar to Trites only these are slightly more powerful and can take a bit more damage.
LOST SOUL
These are the flaming heads that are seen flying around, these are often found in groups and, while individually are not hard to kill; they can be a problem when you face a lot of them at once. The best way to take them out is with something like the machine gun which can dispatch them quickly and from a distance.
CACODEMON
These are like the lost souls only bigger, they float around the levels often on their own or in pairs and shoot lightning at you. They are also quite hard to hit because of their speed and can take quite a lot of damage. The best way to kill them is again with the machine gun or chain gun, don’t use the plasma gun as they are hard to hit with it although the shotgun is very effective if you are unfortunate enough to come into close range of one.
REVENANT
These demons are particularly nasty; these are the armour wearing skeletons armed with rocket launchers first seen about half way through the game. The homing rockets they fire make them extremely dangerous and they can take a lot of damage. Revenants can be taken down with a couple of shotgun blasts from close range but the best way to deal with them is from a distance with the plasma gun, the plasma is both extremely effective against the revenant and it destroys the rockets it fires at you.
COMMANDO
These come in two forms – regular and chain gun commandos. The regular ones are the ones you meet first; they are fast moving you and attack you with the tentacle on their right arm. While they can take a lot of sustained machinegun fire, a couple of shotgun blasts from close range as always, is enough to kill them.
The commandos armed with chain guns are much tougher though. While they can take no more damage, their chain gun can cause a lot of damage to you and also knocks your aim off target. This can make killing these extremely difficult and the soul cube is ideally suited to killing demons such as these.
CHERUB
These are the evil half baby, half demon creatures which are extremely nasty and hard to kill. While a single shotgun blast from close range is enough to kill them, their speed makes them incredibly hard to hit and they also have a powerful attack.
MANCUBUS
You face three of these in the Recycling Sector level; these are very powerful and hurl fireballs at you. To kill them simply throw everything you’ve got at them and don’t attack them from close range as you won’t last long.
ARCH-VILE
These demons can summon other demons to attack you as well as being armed with fireballs which it shoots at you. The best way to take out Arch-viles is with the soul cube or BFG.
HELL KNIGHT
Hell knights are like giant imps only much more powerful with a fireball attack that can cause serious damage to you; again these should be dealt with by using either the soul cube or the BFG. These are first found in Hell where they can be extremely difficult to kill but later one use the soul cube to quickly kill them.
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WALKTHROUGH
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MARS CITY
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Head up the stairs and up the ramp in front of you and go in the door and stand on one of the scanning pads on the floor. When the scan is complete go through the door and then through the next door in front of you.
During the cutscene you’ll receive your PDA and be told to report immediately to Marine command. Take a right and go up the stairs and follow the path until another cutscene starts. Go left again and go straight past the kitchen and through the next doors.
Go through the door on the right and go right at the Marine and then through the door labelled ‘Marine Command’.
After the next cutscene follow the sentry bot to find your gear, when the bot deactivates itself, walk down the stairs and open the cabinet with the code ‘396’, then enter the lift and go to the substation.
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MARS CITY UNDERGROUND
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Exit the lift, approach the marine behind the glass, then take the body armour and pistol from the locker on your left and head out through the door. Walk across the walkway and down the stairs, then through the next door. Keep following this path until you come to an opening on the left with a cabinet in it, collect the PDA from the table and open the locker with the code ‘531’ to get some more armour and a medipack.
Again keep following the set path until you come to the scientist working on a machine, here go right through the door and when the lights go out, press ‘F’ to select your flashlight and continue down the stairs.
Go down into the garage area and take the pistol by the marine then enter the airlock. Activate the airlock and when the doors open sprint across the bridge and into the airlock on the other side.
In the next room, enter the lift and take it up to the communications level. Now just follow the path until a cutscene kicks in and the invasion begins. Shoot the scientist when he turns into a zombie and turn around and shoot the marine zombie that appears through the door behind you.
Head through the door and shoot the zombie in the next room and go straight through the lift on the other side and take it to ‘surface access’. Go back through this area and back through the airlock to the garage area. When the doors open, shoot the zombie to your right and go up the stairs and through the next door.
Watch out for the zombie armed with a wrench that appears as soon as you open the door so dispose of him with a couple of shots to the head then continue retracing your steps through the next area. When you get to the bridge the scientist as working on earlier use the control pad to extend it then use it to get across and shoot the marine zombie that appears from the darkened area to the left of you.
Go through the door in front of you and shoot another zombie marine, then go down the stairs to your right and head toward the far left corner of the room where a zombie appears from a small opening in the wall. Take the PDA from the desk and use it to get through the locked doors on the opposite side of the room.
Watch the scientist fall to his death then go to the end of the room and shoot the zombie to the right before going through the doors to the left.
Collect the shotgun and armour from the crate below then shoot the 3 zombies on the lower level you come to. Climb back up using the ladder and go through the door at the other end of the hallway. When the lights go out, shoot the zombie that appears from the stairs. Go up those stairs and take out the zombie and marine zombie at the top.
Walk forward and when you hear a strange noise turn around and kill the zombie that’s advancing on you then shoot the second one behind you. Collect the ammo from the shelf at the far side of the room then continue through the door and through the next door to the right.
Shoot the imp with your shotgun and shoot the second one that appears when you advance further into the room. Switch back to your pistol and kill the zombie to your left in the darkened area.
Go down the stairs and quickly shoot the zombie that appears from the darkened area then quickly turn round and equip your shotgun to deal with the imp that appears from behind you. Go through the door and straight through the next one
Heal yourself at the health station and shoot the imp that appears when you go down the stairs. Continue through this room and kill the zombie that appears from the darkened area to your left then continue through the next door.
In the next room, take a right and go through the next door and straight through the next area. Watch out for the imp that leaps at you when you go through the next door. As you enter this room a zombie marine appears behind you so dispatch him quickly and search the room for goodies.
In front of you can hear a worker screaming, then an imp appears so deal with it and exit through the door at the end of the room. Go straight through the next room ignoring the dead body hanging in front of you. Approach the stairs in the next area and an imp appears from under them and smashes them. Kill the imp and go up the stairs.
In the next area an imp appears next to some explosive barrels – I think you know what to do! Then head back up the stairs avoiding the falling crates and exit through the door at the top dealing a swift shotgun shell to the head of the imp that appears. Approach the dead marine and shoot him when he gets up. Next use the control panel behind you and leave via the lift that the control panel unlocks the door to.
When you leave the control room you’ll have to deal with another marine zombie, an imp next to the lift and another marine zombie in the lift. Enter the lift and take it back to Mars City.
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MARS CITY
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Exit the lift and shoot the zombie marine that appears from behind the crates, go left and approach the maintenance ladder to the left by the storage lockers. A worker tells you to get up to his position. When the ladder drops down, climb up it and talk to the worker at the top.
He tells you to go for help so exit through the shafts on the opposite wall. When you come to the first junction, go left and get the armour from the opening then go right down the 3 pipes and drop down at the end.
Enter the lab in front of you, when you hear a zombie groaning turn around and kill the zombie behind you and the one that appears from the left. Collect the PDA from the desk in front of you then crouch under the flames and exit through the door on your left.
When you here the radio chatter get ready as two zombie marines appears through the doorway to the right. One is armed with a shotgun and the other is armed with a machinegun. When they are both dead go through the door they came through and search the area to the left in the next room. In imp jumps at the window but it can’t get in. The room contains a key-card, 2 clips and a medipack.
Go back though the door and use the key-card on the door at the opposite side of the area. As you enter the next room, a marine zombie armed with a pistol appears so shoot him, advance a bit further and another one appears. If you look through the windows here you can see a sentry bot taking care of several more marines. When it’s clear go through the door to your right and then through the door to the left.
When you enter the next room the lights dim and two zombies appear in the room and another one behind you. Quickly kill them with the shotgun and enter the room in front of you. To the left there is some armour and a clip, collect them and another zombie appears in the room. Take care of him and collect the shells at the opposite wall and go through the door.
Listen to the conversation and when they’ve all been killed, collect the pickups and follow the corridor. When the flaming zombie appears, shoot it with the shotgun. Enter the next room and take out the marine zombie that appears from behind the tanks. To avoid damage while taking him out you can take cover behind the door with your shotgun equipped; eventually the zombie will come looking for you so you can just blast him the minute he appears. To the right of the gas tanks there is another marine zombie. Go behind the tanks and collect the armour there, an imp and a zombie appear behind you so kill them with a couple of shotgun blasts.
Go right and when you approach the doors an imp drops from the ceiling, blast it with several shotgun shells while moving backwards to kill it. First enter the room to the right and collect the ammo there then enter the infirmary.
Heal at the health station and collect the PDA from the table, open the locker with the code ‘347’. Go through the door and shoot the zombie that gets up off the operating table. Continue through to the next corridor where another flaming zombie appears from the shadows.
Shoot the zombie and go right and kill the zombie that’s just killed the marine, continue to the area with all the dead marines and approach the computer that’s saying ‘video linkup requested’. After the video you get new objectives to meet up with Bravo team.
Enter the combat prep room behind you and use the code ‘584’ to enter, stock up on ammo before going back to the corridor where you saw the zombie killing the marine and take the first left. Your new clearance will allow you to enter the restricted area. Switch to the machine gun and shoot the two zombie marines that appear. Go through the door to the left and kill the two zombie marines that appear in front of you. Turn around and kill the marine zombie and regular zombie that appear behind you then enter the kitchen.
Kill the zombie in the darkened area, enter the darkened area and kill the zombie marine that appears behind you. Collect the bullets the marine drops and exit the kitchen and go left.
Enter the toilets in front of you and search them for health. Then approach the mirror and when the vision is over switch to the shotgun and kill the imp that comes through the door. Go back through the door and go left into the next area, avoid the marine zombie that appears and let the sentry bot deal with him.
Follow the sentry bot through the corridor and let it deal with any enemies that appear. In the next room, there will be several zombies whom the bot takes care of, when the bot goes left; go down the stairs as there is some ammo in the area below.
Watch out in the next room as a marine zombie appears out from behind a pillar, the bot will again take care of him. You will now get a radio message telling you to get to bravo team as quickly as possible. Continue following the bot until it deactivates itself in the next area. This area contains two imps (the bot may have killed one of them already) so equip your machine gun and kill the other one.
In the far right hand corner of the room, there is a small air duct, enter it and go up the ladder to the next floor, up here you will find some shells, health, and ammo as well as another PDA which is found next to the dead scientist. Go back to the ground floor and take the lift to Administration.
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UAC ADMINISTRATION
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Exit the lift and after the cutscene shoot the zombie marine that appears from the door on the left. Collect the armour and health around the room and go up the steps on the left and approach he body sat on the bench, shoot it when it gets up and continue through the doors.
Once in the corridor, walk forwards until a roof panel falls down and move backwards to avoid the imp, take cover by the doorway and shoot it when it appears. There is also a marine zombie around the next corner and another one appears when you kill the first one.
Enter the office and collect the PDA and video disk from the desk on the front, go to the cabinet and shoot the zombie in the dark area to the right, next open the storage locker with the code ‘586’. When locker contains some armour and grenades and in the dark area where the zombie was there are some shotgun shells.
Exit the office and go through the door to the alpha labs. As soon as the door opens an imp pounces at you so kill it with a shotgun blast. In the next room, avoid the fireball from the imp behind the machine as it runs of before you can shoot it. Go through the next door and avoid the barrels that are being thrown at you by the zombie on the walkway above.
Go left in this area then talk to the injured marine. Try to open the doors to the Alpha labs but they are locked and you’ll get a new objective to get the PDA of William Banks in order to get clearance.
Retrace your steps through the last two rooms and shoot the imp that’s appeared to the left in the third. Continue retracing your steps to the room you started in and two imps destroy the damaged door in front of you, kill the imps and go through the newly opened door.
In the next room, the lights go out and an imp appears on the roof and climbs down the wall, shoot it and the one that appears behind you. Go through the next door, in here a zombie marine appears to your left. Collect the ammo and health in the area in front of you then continue along the corridor where there is another zombie marine, and go through the next door.
Go into the room behind the glass on the right and use the computer to override the security, equip your shotgun here and when the pinky bursts in unload several shells in its face. Exit the room through the smashed glass and shoot the imp that appears next to the now unlocked doors. When the imp is dead go through the door that you’ve just unlocked.
Go up the stairs and at the top a panel in the wall opens and a pinky appears, immediately sprint backwards while firing at it to avoid taking damage then kill the marine zombie that appears behind it. Go to the end of the corridor and an imp appears on the stairs you just came up.
Enter the room on the left and get the health and the PDA, then open the locker with the code ‘0508’ to get some armour and the chain-gun. Exit the area through the corridor on the opposite side near where the pinky appeared.
When you get to the walkway where the first pinky appeared, you get a radio message telling you that there is a sort of growth taking over parts of the base. Continue following this path.
Enter the next door you come to and advance into the room it leads to, when you get about halfway across a panel in the wall behind you opens and an imp attacks you from behind.
Go through the door to the executive offices and listen to the conversation below, through the next door there is a marine zombie that attacks you from the left and a regular zombie that’s walking around the room. There is some armour near where the marine zombie was in a small opening. Next enter the room with the pentagram on the floor and the growth on the walls.
Collect the PDA from one of the scientists and shoot the imp that spawns in the centre of the room and then shoot the one that appears outside. Exit the room and go left, another imp spawns, kill it then enter the room on the left to get some armour. Go left out of the door with your shotgun equipped and shoot the imp that appears right in front of you.
Go straight through the next door and down the stairs, there is a regular zombie at the bottom but he shouldn’t cause you any trouble. In the reception area, go left through the doors to the Alpha labs. In the next room the lights go out for a moment and two zombie marines appear in front of you.
Enter the office on the right and open the locked door with your newly acquired clearance. When you come to the ladder on the left, ignore it and instead go right through the door and collect the PDA and grenades from the next room.
Go back to the office you were just in and approach the doors to the Alpha labs, as you approach an imp spawns near you so kill it then go through the doors. Go through the next few rooms to get to the area you where in before and use the controls by the door to get access the labs.
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ALPHA LABS – SECTOR 1
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Use the button on the right to open the doors and exit the lift. Go behind the desk on the left and when the room darkens and you hear the evil voice equip your shotgun and shoot the four zombies that appear from the left. They are quite difficult to spot since the room is so dark, so stand in the middle of the room with your shotgun and use the torch to spot the zombies – wait for them to get close and then quickly switch back to the shogun and take them out with a swift shot to the head, repeat this process. If you take some damage then there is some health on one of the seats on the left and there is a health station on the far right near where the zombies appeared.
Go behind the desk again and use the computer to unlock the door, now go through the newly unlocked door. There is a marine zombie patrolling in this next room and another one behind the crates on the left side, once you’ve taken care of them go right where you’ll face a regular zombie then go through the next door.
You’ll be instantly attacked by an imp and then by two marine zombies that come through the door in front of you. Jump through the smashed windows to your right and an imp spawns to your right and one to your left.
Open the storage locker on the other side of the area with the code ‘752’. Enter the control room next to the locker and kill the marine zombie inside, the screen then goes red and a regular zombie appears from the shadows and an imp just outside the door. Collect the video disk and PDA from the desk and exit through the other door – watch out for the imp on the right.
Use the computer to open the maintenance access to the laser shaft and take care of the zombie marine on the opposite side of the room. Crouch and enter the shaft and go to the end and on the right use the controls above the air duct then enter it when it opens. There is a zombie marine patrolling in the area it leads to so eliminate him when he walks past before entering the next room.
Go left and shoot the zombie you see then take the stairs right, on the right there is some armour and another zombie then go through the door to the left. In the corridor you find yourself in, to the left is a health pack then go to the right. Around the corner an imp appears from the right then the room darkens and there is another evil laugh, move down the stairs and kill the zombies – one appears from behind the pillar in front of you and the other two from the right.
The corridor behind the door on the left is blocked off by fire but you can get some armour and shotgun shells off the dead marine there then take the path to the right. In the next area you get attacked by three zombies – 2 from in front and one from behind. Search the area for some shells and a medipack which are both guarded by a zombie then head up the stairs.
There is a zombie to the left but go to the right and collect the ammo and PDA from the desk. Next use the computer to stop the fire. Backtrack to where you found the dead marine in the corridor that was cut off by the fire from the way you came until a cutscene starts. On your way there you’ll come across a couple of zombie marines and an imp but nothing you shouldn’t be able to handle. The cutscene shows a maggot crawling out of a vent, these are just like the imps except without the ability to throw plasma balls at you and can be killed just as easily. There are four in total and once they’re dead a floor panel is lifted up off the ground.
Jump into the vent and follow it and take the first turning on the left, climb out here and two zombies appear in front of you. Go left at the far corner and through the door at the end. Shoot the explosive barrels in here to kill the zombie marine and go right through the next door and kill another zombie marine on the other side.
Go up the stairs at the end and kill the maggot and the zombie marine that appear when you approach the door. Collect the goodies you find and continue through the door. Go straight up the stairs to the left and there are some armour shards on the floor in front of you. If you try to pick them up a wall panel opens and an imp jumps out at you.
Go up the night set of steps and through the door at the top, in front of you there is a dead marine so pick up the ammo he has dropped then continue right. In here your vision goes red again and two imps spawn in at opposite sides of the room, swiftly give them each a shotgun blast to the head. On one of the blue pillars in the middle there is a switch, use it to lift up the glass allowing you to get to the shotgun shells behind.
Continue through to the next area, in her there is a zombie in the darkened area to the left and a video disk on the desk in front of you. Go through the door on the left and shoot the maggot to the left. There is a zombie by the desk to the right, approach the desk and a wall panel opens on the right revealing an imp. Shoot it and then use the computer in front of you.
Enter the newly opened area where the imp appeared and climb up the ladder to the right. Go straight through this room and approach the scientist in the lab. Wait for the Hydrocon machine behind him to lift up then run through and collect the dead scientists PDA from his body on the right. There is some health and armour around the corner to the left, collect it if you need to then drop down the hole in the floor and unlock the previously locked door.
In here there are 2 zombies, a normal one and a marine one, eliminate them both and if you take damage collect the health near the right wall before exiting through the next door.
In here you get attacked by 2 maggots, kill them and kill the maggot in the room opposite. Take the door on the right in the next hallway. When you go through the next door a maggot appears from the floor and a marine zombie behind you. If climb into the hole that the maggot appeared from there is some armour and a clip.
In the next room there are 4 maggots that attack from all directions, in this room there are some shells, armour and health to be found. When your done enter the lift and take it down to sector 2.
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ALPHA LABS - SECTOR 2
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Exit the lift and go right, when you see the body being lifted up and carried away by an unknown force, 2 imps teleport in. Go through the same door that the body was carried through and go in to the toilets on the right. Just as you enter there is a zombie to your left and two more that appear when you enter the room. When the zombies are dead a maggot appears. Climb up the ladder in the far corner.
Crouch and enter the air ducts, you can take the first right to find some ammo and health guarded by a maggot; otherwise continue one to the end. There are two imps in the corridor you drop into. Go right and enter the room on your right and shoot the two zombies in here and collect the PDA of the desk.
Exit this room and then go through the next two double doors, in this corridor there is a maggot and an imp. Quickly kill them as the room has one of its windows smashed making the area a vacuum. Sprint through the next doors, on the walkway to the left an imp appears and also a zombie marine that comes through the next double doors.
Go straight through the next two rooms and when you get to the main compressor area a maggot teleports in and 2 zombie marines from the corridor you where just in. There is a video disc by the computer on the right then go through the next door. In were there are two zombie marines and an imp, you’ll probably take quite a lot of damage while battling them but fortunately there are several health pick-ups around the room. Also a wall panel falls down revealing some ammo.
Get onto the lift and take it to the lower level. While you are on the lift, an imp and a maggot climb down the shaft after you so try and take them out while they are climbing as then they can’t attack you. Behind the crates there is a health pack and some armour shards then go through the door in front of you.
Approach the scientist in this room, he tells you he’ll lead you through the next area if you help him get of the base. Follow him into the darkened room, eventually you are attacked by an imp so quickly shoot it with your weapon of choice then return to the scientist. Just before you go down some steps in this room, to the left is a health pack in a dark corner.
When you come to a T-junction an imp appears from the right and in the next area there is another imp after the EMP wave that disables your torch for a couple of seconds. In the next room there is a maggot on your left. In the final room with the ladder in the centre, the room goes dark and you unable to use your torch for a second or two. An imp appears from the left and the scientist dies no matter what you do to save him. Next simply climb up the ladder to proceed to the next area.
Behind you at the top of the ladder there is a storage locker, open it with the code ‘102’, it contains some armour and two clips. Then go through the next door and climb over the pipes and onto the floor. On the right near the locked door there is some health, then crawl through the air duct and follow it until you can get out at the end. Make your way through the next shaft and kill the Trite in the room at the end of them.
Use the panel in front of you to extend the ladder and then kill the Trites that appear. Once they’re all dead grad the health and armour from the left side of the room then climb up the ladder where there are another three Trites. Kill them then go through the door on the left and use the panel to travel to sector 3.
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ALPHA LABS – SECTOR 3
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Just as you exit the lift you will be attacked by a zombie marine and an imp so crouch by the crates and take them both out with the shotgun when they approach you to avoid taking damage. Around the next corner there are two more zombie marines and another imp.
Clear the maggot and the trites out the area to the left as you go up the steps then enter the room on the right. When you enter this room you’ll here the now familiar sound of a zombie marine behind you so kill it then take the PDA from the desk.
You now have to transfer the toxic barrels into the incinerator, to do this you must use the controls in front of you to direct the crane over the barrels, pick them up, then move it over the incinerator and drop it in then repeat this process.
When both barrels have been destroyed you get a message from Sgt Kelly and a new objective to locate the entrance to sector 4. Exit the room and go right where there is a maggot along with several trites. Then enter the waste incinerator on the right. Collect the key from the centre of the room and go through the door in front of you, collect the PDA from next to the storage locker and open the locker with the code 123. If you raise the platform then you have to face two zombie marines, kill them by shooting the explosive barrels around them, then collect the armour they drop. Then backtrack to where you killed the maggot and trites at the beginning of the level and use he key to open the locked door, you’ll face four zombie marines on the way there.
There are several enemies in here including trites, a marine an imp and a maggot. Open the locker on the left with the code ‘123’. You can jump down onto the pipes below the stairs to find some health and ammo. In the next room there is a zombie marine and an imp.
Approach the locked door on the right and you will be attacked by trites and a zombie marine will come through the door unlocking it. Kill them all then go through the now unlocked door. There are two zombies in here, one that appears from the left and the one standing in front of you which attacks you when you approach it.
Go left here and collect the chain gun from the centre of the next room, this causes a wall panel to lift up revealing some armour, collect the armour and you’ll be sealed in and when the panel opens you’ll be greeted by an imp and three zombies. Blast your way back down the corridor to the area you where in before.
Take the door on the right and kill the zombie and the trites in here then take the lift down. Kill the imps and maggots that appear down here. Enter the next room and kill the two Pinkys in here then approach the locked door. This causes an imp to appear behind you. Kill it then approach the door again, the window next to it is smashed so climb though it and open the locker on the right with the code ‘123’. Go through the door on the left and travel to sector 4.
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ALPHA LABS – SECTOR 4
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Collect the bullets from the desk next to the computer then go left through the door. Approach the control panel by the windows in the centre of the room and either free the scientist by opening the chamber or kill him by activating it. Take the door on the other side of the room and take the lift down and talk to the scientist at the bottom (if you saved him). Follow him into the office and collect the PDA and video disk, use the computer to the right of the scientist to open the locker containing the weapons, and then leave the room.
Go through the other door and again through the next two. When you open the second door an imp pounces out at you with a zombie marine following it. There is another two zombie marines that needs to be dealt with on the walkway in front of you. Walk into the room and kill the trites that appears.
If you need health, there are two health packs on the right hand side of this room, and then go up the stairs in the far left corner. There are three more zombie marines up here; one of them appears on your left and the other two on the other side of the walkway who can be easily killed by shooting the explosive barrel.
Once the zombies are dead, trites appear from an opening in the wall and from down below which follow you up the stairs, the ones below can be killed easily by throwing grenades down the stairs. Go through the door directly in front of you and collect the PDA from the computer on the right. You go down the ladder on your right and explore the area below, it contains some pickups and some imps.
You now have a choice of doing two things here:-
1 –activating the EFR system
2 –extend the service bridge
Activating the EFR system is quicker and generally easier (and brighter!) although you have to make a few tricky jumps. If you extend the bridge you’ll face more monsters (in the dark since the lights don’t come on) but I prefer it since you can find a plasma gun this way which is useful against the boss.
If you activate the EFR system:-
Use the machine that activates as a bridge and do two running jumps to get across. When you get to the rotating bridge, wait for it to face you then run and jump onto it and get of at the unlocked door on the right.
Enter this room and two maggot’s teleport in, kill them then use the computer to start EFR processing. Exit the room, kill the maggot that appears and get back on the bridge and go to the other door which is now unlocked.
Go through the door, there is a zombie marine to your left then jump on the moving platform. Now simply avoid the various pieces of machinery, there is a small opening on the left, you can jump off here to get some armour shards then simply jump onto the next platform.
When you get off at the end, go through the door and kill the imp and a couple of trites on the left, then go to the computer terminal below and initiate the magnetic field. Now go back up the steps and jump across the two generators avoiding the rotating arms.
Kill the two imps on the other side and use the panel on the right to pen the storage area. Now leave via the door and jump onto the moving platform, get off where the zombie marines are, kill them and search the area for pick ups then go through the door at the end. Kill the zombie marine in here then continue through to the area with several dead marines in it.
If you activate the service bridge:-
Two zombie marines come through the door behind you. Kill them then cross the two bridges and go through the door at the end. As you approach it a zombie marine comes through it. Kill the trites in the next area then go left through the next door. Kill some more zombie marines in here and collect the ammo. As you approach the door a maggot spawns in at the other side of the room.
Go through the door and cross the bridge, a wall panel opens revealing an imp and a ladder. Kill the imp and climb the ladder and shoot the maggot at the top. Now follow the passageway killing the maggots and trites. Climb down the ladder at the bottom. A wall panel opens on the left, enter the area it reveals and go right where the wall lifts up, now follow this passage to a room containing the plasma gun. When you collect it you’ll have to battle several imps and there are some zombie marines waiting for you near the ladder you just came down.
Cross the bridge and kill the trite and maggot in the next room, there is some armour in the darkened corner near where the trite appeared from, and then climb the ladder.
Kill the marine zombie that comes through the door then open the locker with the code ‘651’. Go through the next door, cross the bridge and in the next room, kill the trites that are under the stairs, there are loads of them so use the plasma gun here. You will probably take damage, behind the stairs there are some armour shards and some health.
Go through the next door and kill the three zombie marines across the bridge. Go right up the steps and through the door at the top, shoo the zombie marine in here then continue through the next few rooms until you come to a room with several dead marines in it.
The two different sections end here for the boss battle.
Stock up on health and ammo here and go through the door to face the boss.
To kill the boss simply equip something like the chain gun (the plasma gun is quite effective) and strafe while shooting, avoid being trapped into a corner and keep moving and the boss will be killed quickly and relatively easily. Now enter the unlocked door and travel to the Enpro facility.
Thanks for reading! I hope this walkthrough has been of some use to you.
This walkthrough was written by me so please don’t copy it or post it on any other sites without my permission.