Step out of the elevator and a cut scene will take place. Once the cut scene has finished a zombie with a pistol will come through the door to your left. After you kill the zombie to your immediate left there will be some seats with armor and a medkit. Now go forward and go behind the desk and pick up the medkit if necessary. Now on your right you will see the door from where the zombie with the pistol came out from. Go towards it and a zombie sitting on the seats will get up. Kill him and walk through the door.

Turn right and continue down the corridor. Once you reach the next corner an imp will jump out at you. Kill him and 2 zombies with machine guns will also come around the corner. Once you go around the corner you will see a door infront of you. Go through the door and there will be a health dispenser to your immediate right. After you get health from the dispenser go forward and you will see a dead scientist halfway out the window. On the desk to his left will be a PDA.

Now turn around and you will see a locked cabinet. Walk towards it and a zombie will come out from your right. Kill him and go to the cabinet. Open it with the code 586. Inside will be: Armor, A clip, shells and hand grenades. Now turn right and walk into the corner. There will be 2 boxes of shells. Now turn left and go out the door you came in from. To your right you will see a door labeled Alpha Labs. Open it and an imp will leap at you. Kill him and proceed through the door.

Go forward a few meters then turn left. There will be a window straight ahead. Through the window you will see a mechanical arm moving around. There will be an imp on the other side of the window who will throw a fireball at you then retreat. Now crouch jump through the window. If you can’t then try breaking the window with your flashlight. Now go to the upper right corner of the room and there will be a backpack full of ammo and armor and 2 medkits. Now turn around and jump back out through the window. Follow the walkway and a zombie will throw an explosive barrel at you. Don’t worry as it won’t explode unless it gets shot. Infront of you, you will see a pillar.

Walk into it and you will get some shells. Now turn left and you will see a big door labeled Alpha Labs. Go towards the door and you will see an injured marine leaning against a crate. Next to him will be some crates. He will tell you that the demons surprised his whole squad and killed them. Now try to open the door by using the control panel the right of it. You will now have a new objective. Now turn around and keep going forwards until you get to the wall. Turn left and follow the corridor until you see a door. Go through it and there will be an imp to your left. Kill him and there will be armor in the corner where he was.

Pick it up and continue down the corridor. Once you reach the lobby go through the door a few steps and turn left and there will be a clip and some shells. Now go down the stairs to your right and the big doors opposite to you will get broken through by some imps. Go forwards and walk through the busted doors. Now turn left and there will be a clip infront of you. Go pick it up. Now turn to you right and there will be a medkit on the wall opposite to you. Go towards it and the lights will go out. Then an imp will come up behind you and infront of you. Kill them and grab the medkit.

Now turn right and there will be a door. Go through it. From your right 2 zombies with machine guns will come around the corner. Kill them and walk forwards into the office. Now turn left and on the desk there will be 2 clips. Pick them up and an imp will come up behind you. Now go back up the stairs and turn right. Now turn right and go forwards, take a right then a left and a zombie with a pistol will jump around the corner. Now turn left and there you will see a door. Go through it and you will be in a lobby. Turn right then left and go through the door.

Once through the door there will be a shotgun on the desk to your right. And armor on the left. Right infront of you there will be a red screen with a button labeled ‘Security Override’ Press it and you will see a cut scene of a pinky demon jump down. He will try the bash the door in but will end up jumping through the window. Kill him and go through the window he broke. An imp will come out the door to your right. Kill him and go through the door. Once through the door there will be some stairs, go up them. Once up the stairs turn left and go forwards and a pinky demon will come out from the wall opposite to you. Kill him and there will be a zombie with a pistol to your upper right. Now got forward a bit and the wall behind you will open and an imp will come out. Kill him and go to the wall he opened and there will be 2 clips and some shells. Now go forward and take the first left and the wall will open and a zombie will come out. Kill him and turn around and go forwards. There will be an office with a PDA on the table and a Martian Buddy container.

Pick up the PDA, then turn right and open the Martian Buddy container with the code 0508. Inside will be a chaingun, a belt of ammo for the chaingun and armor. Now exit the office and turn right then left. Take the first turn right and there will be some armor. Then turn right and go forwards. Then turn left and there will be some stairs. Go up the stairs and turn right. Go forward and you will here a radio transmission saying that there is growth taking over the base. Now continue going forwards then turn right, right again then a left. Infront of you will be a cardboard box with shells and armor on it. Pick it up and on your immediate right there will be a door. Go through it and then turn left. Walk forward a bit and an imp will come up behind you.

Kill the imp then continue going forward. To your left will be some stairs and to you right there will be a door. Go through the door to your right and you will be on a bridge. If you look over the side you your left you will see Swann using a computer. Now go through the door infront of you. Once through the door a zombie with a pistol will be on your right and an unarmed zombie will come from the right. Go left and pick up the dead zombies pistol. Now there will be an open door to your right. Go through it and you will be in a room with candles on the ground.

There will be a dead scientist on the ground with a PDA next to him. Pick it up and an imp will teleport into the room. Kill him and 2 more will teleport outside of the room. Now go out of the room and turn left. There will be a door. Go towards it and an imp will teleport in. Kill him and go through the door. On the desk to the left there will be some shells and a clip. Now go out of the office and turn left and you will see a door. Go through it. Once the door opens an imp will teleport in right infront of you. There will be another door directly infront of you.

Go through it. Once through the door you will see some stairs infront of you, go towards the stairs and an imp will teleport infront of you and another one will teleport to your left. Kill them both then go down the stairs and a zombie will come out from infront of you. You will see a door. Go through it and you will be in the main lobby where you started. Now go right and you will see a door. Go through it. Once you open the door an imp will teleport infront of you and another one will teleport in behind you. Go through the door then turn right. Go forward and a zombie with a shotgun and a zombie with a pistol will come to you from your right.

Kill them and go through the door to your right. Once through the door there will be a health dispenser to your immediate right. Heal yourself to 100hp. Now go back out of the room and turn right and you will see a locked door. Unlock it by using the control panel to the right. Go through the door and turn right. There will be some stairs. Go down the stairs and turn left. There will be a shelf with a clip and a medkit on it. Now turn around and there will be a door. Go through it.

Go to your immediate left and there will be armor in the corner. Now go forward to the computer console at the other end of the room. When you reach it an imp will come up behind you. Kill him and go through the door where he came in from. Directly infront of you there will be a ladder. Go up the ladder and there will be a door to your right. Go through the door and turn left then jump down off the ledge. Turn right and you will see a big door labeled ‘Alpha Labs’. Open the door by using the control panel to the right. Now go forward and there will be a control panel to your right. Click on ‘Exit Administration’ and proceed to Alpha Labs.