Alien Walkthrough: Bonus 1
Bonus I: Invasion
Weyland-Yutani Atmosphere Processor.
USCM personnel attempting repair of systems.
Temporary power generators installed.
Xenomorph infestation under control by USCM teams.
Seek the planet surface to escape the installation.
You'll begin this level in a pool of water. Climb up the ledge and turn to the left, down the hallway. This will lead to a small hole that you need to drop down into. Go left in the circular tunnel. You'll start to hear a sentry gun beeping. There will be a square shaped tunnel to your right, so climb into it.
In this tunnel, there are two drops down, one in the middle of the tunnel, and one at the end. DO NOT drop down the middle tunnel, as there is a sentry gun waiting for you. Crawl past it and drop down the tunnel at the end of the vent. There will be a Marine in this room, so kill him. From this point on, Marines spawn randomly throughout the level, and you'll encounter plenty of them, so kill them.
Exiting this room will bring you to a hallway. If you turn left, you can destroy the two sentry guns safely, and another Marine hiding in a room there. When you're finished, go right.
Keep going straight until you enter the control room. Enter another small door in this room and turn the wheel inside to stop the fans. Head back to the main hall and turn right.
You'll see a set of stairs across from you, illuminated by some red lights. Crawl over to them and go down the stairs. This eventually leads to a small room with two wheels, so turn them both. Wait until the fans stop fully before moving into the room with the fans. Enter the vent directly in front of you, with the red flashing lights on either side of it. Drop down.
Power generator room.
Claw the spinning turbine to cut the power. Be careful, as the turbine will explode and might harm you. After a bit of sitting around in the dark, the emergency lights will come on, and it's time for you to continue. Once you reach a room with some large tanks in it, go forward until you reach the wall, then go down the hallway to the left. From here, enter the circular hallway and go left.
Take a right at the first hall and pull the switch to activate the lift. Take the lift up into the next room, then take a second lift in this room. Go along the walkway until you come to an area with stairs to your right and a circular tunnel to your left. Enter the tunnel.
In here, you'll see a hole burned down through the tunnel, running vertically. Drop down into the next room and kill any Marines you find. Turn right in this hallway and continue on until you come to a large room.
DO NOT go through the large door ahead of you! Instead, directly to the left of the door, you'll see a vent in the ceiling. Crawl up into it and drop down into the next room. Go forward then right if you want to destroy the sentry gun.
Continue through these halls until you see the entrance to another big room to your left, with a large tank in it. Ignore this room and glance towards the ceiling. You're looking for another vent. When you find it, crawl up into it. This leads to another area with a pool of water. Climb straight up, where you will see the sky, to end the level.
Bonus 2 --->
