Once the elevator doors open forward a few steps and a zombie with a pistol will jump out from behind the crates directly infront of you. Now turn left and go up the stairs. Go towards the service ladder and a maintance worker will tell you to climb up, he also lowers the ladder for you. Climb up the ladder and will talk for a bit, none of the information is interesting or necessary. In the opposite corner is a small vent you can climb into.

Go through the vent until you get to an intersection. Turn left and collect the armor. Then continue forward and you will hear an explosion. Take a right, and then take a left. Now keep going straight and you will reach a drop. Jump down and a zombie will come from both sides. Go in the direction away from the bloody office and you will find some armor. Now go back to the office. On the desk infront of you, you will see a PDA. Pick it up. The first e-mail will explain why there are chainsaws on Mars.

To your left you will see a jet of flame coming out of a damaged pipe. You can safely crouch under the flame to get to the armor underneath it. Now go straight ahead and you will see a door to your left and a medkit infront of you. Go through the door. When you go through the door a zombie with a shotgun will come out of a door to your right. Go forward towards the crate and a zombie with a machine gun will come out of the same door. Pick up the machine gun and proceed through the door.

Straight ahead there will a busted door; if you look through the window to your left you will see an imp eating a dead body. The imp will look up and jump at the glass. Now turn to the desk to your left and you will see an ATO card and 2 clips for your machine gun. Pick up the ATO card and clips and go out the door you came in from. You will see a door to your right. Use the control panel next to it to open it. On the others side of the door there will be a zombie with a pistol. After you kill it another will come in. In the upper right corner of the room there will be armor and a medkit. Out the window you will see a sentry bot kill 2 zombies then scuttle away.

Now go through the door to your left. You will see another door. Go through it. Once you go through it the lights will go out and 2 zombies will come out infront of you and another one will come from behind you. Go forward a few steps and another 2 zombies will come out infront of you. Turn left and go behind the metallic pillar and there will be armor. Now take another left and there will be some clips for your machine gun. Now go straight forward.

You will see a door to your left. Don’t go through it. Go right. Turn left and there will be a zombie with a machine gun waiting for you. Go forward around the corner and there will be another zombie with a pistol to your left. Go left and then take a right and you will see some armor in the corner. Now go back and turn left to where the zombie with the machine gun was. There will be a medkit on the ground next to the computer. Turn around and go straight and you will see a medkit in the corner. After picking it up turn left and go through the door. You will hear 2 men talking and getting killed through the vent straight ahead. Now turn left and go forwards. A flaming zombie will jump out at you. Kill him and take the medkit from behind you if you need it. Now go forwards to the end of the corridor and you will see a door to your right.

Go through it and a zombie with a pistol will come out from behind the pipes infront of you. A fat zombie will come from your left and a zombie with a machine gun will come from your right. After you kill those 2 an imp will come in from the same place the zombie with the machine gun came in from. Go back to where you came in from and there will be a small passage to the left where the fat zombie came in from. Inside there, there is armor. Now go straight forward and look behind the pipes. There will be more armor. Turn left and you will see 2 doors

Take the left door, labeled ‘Infirmary’. To your right will be a health dispenser. Across from the health dispenser will be cabinet 017, the keycode is 347. Inside there are 2 boxes of shells, 1 clip, armor and a medkit. Behind you is a table with a PDA on it. Now go through the door up the upper right corner. In the room there are 2 operating tables. On the one closest to the door there will be a zombie who gets off the table and attacks you. After you kill him 2 zombies with machine guns will swarm into the room from the door in the upper left hand corner. On the second operating table there is a syringe which gives you unlimited stamina for a while. In the upper right hand corner of the room there is a medkit. Now go through the door to your left.

When you do a flaming zombie will come out from the left. Go left. Then take a right and you will see a jet of fire. Crouch under it and you will get shotgun shells, a clip and a medkit. Now keep going forwards and you will see an unlocked door. When you try to open the door it will fail. There is also a PDA next to a dead body by the door. Now go back to jet of flame. Go under it towards the corridor.

Turn left then keep going forward. Go down the corridor and take a left. You will see a marine get killed by a zombie. Kill the zombie and go straight forward. You will see stairs to your left there will be a dead body with a clip next to him. Go through the door directly behind him. You will see the combat supplies. The code to the door is 584. Inside are some shells, 2 clips, armor, a medkit and shotgun. Now go out of the combat supplies room. And back into the corridor. Directly infront of you will see some stairs. Go up the stairs and turn right. Go up to the console. You will get a briefing telling you that you have to link up with Bravo team.

Jump over the railing to your right and go straight forward. There will be a zombie with a machine gun at the end of the corridor. Kill him and grab his ammo. Turn right. When you do another zombie with a machine gun will come around the corner. Now go back into the corridor where you just were and take a left. You will see a door. Go through it. A zombie with a machine gun will come from your left. Go right and go down the stairs. Take the first left and kill the zombie just around the corner. There will be a medkit on the ground. Now go back to the intersection and go through the door to your left. A zombie with a pistol will come from the left. Kill him and a zombie with a machine gun will come from the left.

After you kill him another zombie with a pistol will come from straight ahead. Take a left. You are in the common room. Take 2 lefts and there will be a zombie with a flashlight around the corner. In the corner from where the zombie came from there will be a medkit. Across from the medkit will be Super Turbo Turkey Puncher 3! But it’s broken  To your right you will see the kitchen counter, look behind it and you’ll find some armor.

Now go out of the common room. And take a left. Go straight ahead into the bathroom. On the floor there will be armor. Look at the bathroom mirror to see some cool stuff. After you look at the mirror an imp will come from the door to your left. There is a medkit in the furthest toilet. Now go back into the hallway and take a left go forward and a zombie with a shotgun will come from around the corner. Now keep going along the corridor until you get to an open area. To your left a zombie with a machine gun will come through the door but a sentry bot will kill him for you.

The sentry bot will follow you. Go through the corridor straight ahead. Follow the corridor until you reach an open area. A fat zombie attacks you. Go down the stairs. Turn the right and you will see a medkit. Pick it up if you need it. Now go back through the corridor. Turn right, go up the stairs and through the door. Just follow the sentry bot and let it kill all the monsters for you. When you get to the first open area. Go down the stairs and turn right. There will be some shotgun shells for you to pick up. There is also a medkit behind the crate in the corner. Now follow the sentry bot back up the stairs. Take a right and you will a door.

Go through it. At the far end of the office is a medkit. Now go back out of the room and follow the sentry bot. You will reach a room with a ledge with an imp on it. While the sentry is killing that imp turn around because another one will come up behind you. The sentry bot will shutdown after both imps are dead. Now go into the upper right corner of the room and you will see a vent. Crawl into the vent. Take a left then climb up the stairs. Now walk forward and there will another vent to the left. Crawl into the vent. You will now be on the ledge where the imp that the sentry killed was. To your left there is a medkit, some armor and some shells.

Turn left and there will be a dead scientist hanging over the edge of the ledge with a PDA next to him. Pick up the PDA. Now jump down off the ledge. Go take the corridor that’s to the far left. Follow it until you get to a door. Go through the door. Right infront of you there will be a locked door. Go use the control panel to the left of the door to unlock it. Straight ahead will be a medkit and a clip. Once you have picked those up take a turn left and there will be armor and a clip on the desk.

Now exit the room with the door you came in from. Straight ahead you will see a door. Go through it. Now go left and follow the corridor. When you reach the opening again turn left and you’ll see an elevator. Call the elevator. Get in the elevator and take it down to Administration.