Map 1[edit]
Go to the communication center. Talk to a man in front of you for directions if you need but it's really hard to get lost. That's left, right, left and through big doors and the end of the corridor.
After a series of cut scenes you will appear in a cell with no weapons. When you gain controls, another convict will charge at the guard and get killed. Don't waste any time, grab his knife and kill the guard. Now you have a pistol. It's a bad weapon, but you don't have much choice.
Take the mini-elevator up and shoot another guard. Near the elevator you've just used there is a box with ammo and flares. The other elevator doesn't work but you can read a PDA next to it. When you're done, escape through the only door you can open.
Climb the ladder until you come to a locked hatch. Use the switch and the hatch will open. Sounds obvious but don't forget to close the hatch behind. If you don't, one more guard will spawn behind you and start shooting at you. Close hatch for safety or don't if you're feeling bloodthirsty.
Eventually you will come to a technical corridor of some sort. There's only one way ahead. Pretty soon you will come to the middle part of the construction you're in. Don't come too close or you'll get smashed by an elevator. Ride the elevator up and go to another technical corridor. From there you will see death of some guy and head some alien noises. Creepy.
Go to the room with a dead body and pick up torch in the corridor nearby. The door is closed, so head back to the dead body and look up. You will see a padlock. Use the torch on it for the trapdoor to open. Traverse all the way down the vent shaft for the level to end.
Map 2[edit]
See the big bright red sign with a warning? Cut two bolts with your torch and enter the corridor. Inspect the map. It will provide you with hints if you get lost. The big door nearby cannot be opened, so down the corridor and though the smashed door.
You can inspect a PDA on the floor for another part of the plot. Here it looks like you have a lot of ways to follow. Actually, the way is linear. However, you can climb up the ladder to pick up a first aid kit which you will most likely need.
Now follow the corridor behind opened doors and turn left. At the end of the corridor use the switch to open another door and head in. All other ways are dead ends. If you did it right, a screen will shake, explosions will be heard and you will see like some staff being killed by an alien. You cannot save him, but you can examine his PDA.
All doors are locked, so head down the ladder. Open the only door that can be opened and turn left at the corridor. When you come to another junction, you will be attacked by a predalien! Looks creepy, but a few headshots will deal with him, just don't stand still and backpedal constantly.
At the junction turn right and you will come to a few closed doors. Use your torch on a trapdoor on the left and jump down. Use the ladder to climb all the way down and to a vent. Follow it until a few pipes behind you will break by themselves. This will end the level.
Map 3[edit]
Jump down. Yikes, it's a predator! Moreover, it's Prince – the main character of the predator storyline. He won't attack you. You can use a control panel on a door to reveal a circuit to be hacked, but the circuit is not interactive unlike other ones. That's a reference to mission Unexpected Allies where it must be hacked by the predator. In some of the lockers you can find a PDA explaining why the predator was left with his hacking device.
Alright, back to the gameplay. Use the only switch to free Prince and reveal a way out of this room. The predator won't attack you but he will follow you with his head. Go behind the sarcophagus and jump down.
Go through the door and pick up some ammo. There are AP bullets which you will need pretty soon. Smash the vent cover and enter the vent. After a short detour you will come to a small opening. There is another vent cover that cannot be smashed, so take out your torch and use it on the padlock in the opposite corner.
You will come to another padlock. Take it out with your torch. Despite staff will shout about your presence, you're not compromised. Go to the animal storage but don't jump down yet. Sometimes guards spot you, sometimes they don't. If you stay on top of the shelf, you can get rid of some foes with precise headshots without being seen. There are seven guards total but not all of them will spawn from start and some of them may not appear.
Jump down. Sooner or later you will have to leave a good shooting spot anyway. Near one of doors you will find a round alcove with a ladder up. Head up and you will see a cut scene. There's one PDA you can read, a box to open and two buttons to push. The one with text "belt relay" must be pushed anyway. If you are feeling trigger happy and want a good weapon, also press the "specimen stasis online" button.
If you've pushed the big red button, read this paragraph. You will see two heavy guards fighting a bunch of facehuggers. Sadly, it only seems like they're fighting, but they are not actually attacking each other. You will have to deal with all enemies by yourself. There are two guards with flamethrowers and a bunch of facehuggers. Don't mind a scientist being infected and stay away from facehuggers – their single attack can kill you. Only when you come too close to guards and facehuggers, they will attack each other. Kill them all to pick up a flamethrower.
No matter if you obtained the flamethrower on not, sit on the conveyor belt and prepare for a ride. Watch out for steam! You will come to a big room with a lot of eggs. If you come too close to one, it will hatch and a facehugger will emerge, probably killing you. Your destination is a pipe in the opposite corner of the room. You can charge to it hoping for the best or you can shoot eggs from a safe distance.
Once you dive down, prepare the torch in advance. Cut the padlock and swim up. Take a breath, dive down again, cut another padlock and swim up. If you need ammo, climb up the ladder and cut a padlock on a chest, just watch out for guards shooting through grille. Anyway, you must go back to the flooded tunnel and swim forward.
You will find yourself in a room with eggs very similar to the one you've been before. These eggs cannot be destroyed for some reason, but they can hatch, though, sometimes they don't. Run to the ladder and climb up! If you've played the alien campaign or watched the original movie, then you must know that facehuggers can climb walls. Luckily, in the marine campaign they can't. Once you climb up, you're safe.
If you go to the control panel with a scientist in the middle of the room, two guards will emerge from the corridor. Enter that corridor. The room straight ahead contains one guard and a box with ammo. If you're done there or decided to ignore it, looks for a doorway in the corridor and climb up.
Now you're in another corridor. This one has a circular shape. Here are the rooms you can find:
- Observation room has a note in one of the locks.
- Elevator room has nothing at all. You will see some guards fighting facehuggers in animal storage.
- Laptop room has laptop with some plot info.
In other words, there is nothing interesting there unless you want to learn the plot better. Doors with ladders behind them are just to waste your time. Step into the elevator and it will take you down. Don't bother calling the elevator with closed doors, try another one.
Map 4[edit]
Exit the elevator and turn left since the right path in locked anyway. Both doors are closed, so climb down the ladder. Open the only door you can. You will bump into a guard who, most likely, hasn't spotted you yet. Kill him and prepare for a labyrinth of rooms and corridors.
Everything seems straightforward at first. You can only turn left and you can do it right away to the mess hall or at the end of the corridor to the locker room.
- Locker room: You can search lockers for some ammo and a note. Some of them cannot be opened without hacking device which you don't have yet.
- Mess hall: This place contains four guards. You can read notes near one of the tables and another note in a locker near big door.
Anyway, you will come to another corridor. There's nothing of interest these, so head to the mess hall and open huge doors marked "core access level 14A". Go through the four doors in a row to get into another corridor. The door to the right is locked. The door ahead leads to a cabinet with the elevator you need. Sadly, you also need a security badge, so right now it's just a room with more enemies. You can clear it to get some pistol and shotgun ammo and read a PDA.
Turn left in the corridor. If you appeared from the cabinet, turn right instead. You will come to a bunch of locked doors. Head up the ladder and as soon as you reach the upper floor, you will be assaulted by two guards from the nearest corridor. Luckily, all other ways are inaccessible, so you won't be flanked.
Go to the corridor and look at the door on the right. You might hear a shout. That would be a sign that another guard has spawned behind. Inside the room there is a harmless scientist, a laptop with some info, a PDA with more info and a hacking device. Pick up the device and head back. Another guard will attack you. Since you cannot call the elevator on the left, the only way for you is down the ladder.
Now you're back in the corridor you've been before. From here get the hacking device ready. Here are the places of interest:
- Dressing room: Hack the lockers to get AP pistol ammo, a shotgun with some shells for it, napalm, first aid kit and a PDA as a small bonus.
- Corridor where you came from: Look for a POD 2 control panel on the wall and use it to reveal a circuit. Hack it with newly obtained device to gain control to private rooms. There among other items you will find a pass you need. It's on the desk near a laptop.
- Another corridor: Go through dressing room or the mess hall. There you can find the very same POD 2 and use it. Hack it to search the rooms.
Go to the mess hall and fight more enemies. From there open a set of double doors to get to the corridor you've been before. You will be attacked by to guards from opposite sides. When finished, go to the cabinet with the cylindrical elevator which is available now. Ride it down. There s nothing interesting in the next room but a PDA and a CD. Pick up the disk and head back.
Once you come back to the cabinet, one guard will attack you and three more will emerge from the corridor. As you might have guessed, more enemies have spawned in the places you've been before. Head up the ladder. There you will find the elevator you've seen before but now you can use it. At some point the elevator will break down. Use your hacking device and escape through the maintenance tunnels.
Map 5[edit]
At least, your weapons are still with you. Prepare them end exit through the door. Head right to a big room of unknown purpose. Search locks to find napalm and shotgun shells. Pulling the lever will open the blinds which affects nothing. The path ahead is not easy to spot. Look for a big black panel with lights and use it to open.
When you're inside, you need to drop down. You can pick up a first aid kit before that if you jump over the gap. Anyway, once down, open a sentry gun panel and hack it. Jump down again and open huge doors next to you since all other ways are locked. You're in a tunnel with two guards. Surprisingly, your pistol will be the best weapon as these guards run to you. When finished with them, move ahead.
There's a guard in the next corridor, another one will run at you as he hears shooting. Turn left. And another wide corridor with two guards. Open the only gates you can open and you will see another tunnel with a single guard and a box of ammo. Pick up shotgun slugs, you will need them later. If you try to open gates at the end of the tunnel, you will find them locked. Climb the ladder near the gates you've entered.
You're in the open space now. You need to go to the building with a big number 3 on it. Guards will appear below and start shooting at you. Don't worry, they won't hurt you. When you come to a tall structure, turn right and walk on a tiny ledge or whatever it is. They hatch will open by itself. Drop down.
Go through double doors. You will pass three huge doors. Despite quite a number of doors the road ahead is linear since all other doors are locked. There will be a single guard in the next room, a lot of locked doors and a box with grenades. Once finished, call the elevator (and again, only one elevator among those can be interacted with) and ride it down.
Finally! The end is near. However, enemies won't let you out that easy. You can hear some predator noises again, but you won't fight that creature. At least, not now. Head down using ladders. You will see three enemies near a hole in the wall. These are synthets and they have more health than humans. If you keep your distance and not use covers, they will try to hit you from afar and most likely miss. A good choice here is a shotgun loaded with slugs.
You can find your equipment near the ladder. You can pick it up right away being pinned down by enemy fire or safely take it after all the fights. The first option looks stupid, but there are some armor and first aid kit which will be needed. Anyway, it's up to you to decide.
When you're done with synthets, pick up your equipment if you haven't done that before and don't forget a grenade launcher nearby. Loot corpses for a pulse rifle. You have a few seconds to do all the preparations before...
Boss fight: Bad Russian Ivan in an Exosuit
The elevator in the middle of the hall will reveal the boss. He's heavily protected and has some serious weapons, but he's bulky and slow on his feet. Don't get too close to him. The best weapon here is a rocket launcher. Make Ivan spot and start shooting at you. As soon as he starts shooting, hide and wait until firing stops. After that quickly emerge and make a shot, then hide again. Another good strategy here is to strafe without stopping. And never forget to keep your distance.
As soon as you kill Ivan, step on the platform in the middle to end level. You might want to walk around the room picking up some goodies before doing so. And this long part is finally over!