• Look for an airshaft in the security room. Fight your way through it until you come to a ladder. Take it up. Fight your way back to the landing deck.
• When searching for Hall, donÆt ignore dead-ends ù power-ups are often hidden down there.
• Kill everything in the hive, including the eggs and Hall.

• Move straight through the underground passage. Climb up the ladder. Kill the two Aliens and look for the nearby armor.
• Go down the airshaft that the Aliens just came through. Fight your way to a ladder, and then head upward.
• Kill the Aliens, and then look for another ladder into the ventilation system. Go up the ladder, across, and then down into the next room. Flip the switch in the room.

• Leave the room and head toward your APV. To the right of the APV is a door: go in there and take a right. Head down the stairs. Look under the stairs for health and smart-gun ammo.

• Move out into the main hallway and into the nearby room. Move down the service shaft and follow it to the other ladder. Go up the ladder and kill everything in this large hallway.

• Look for some explosive canisters near a door (see pic, right). Shoot them, go through the door, and then hack the security grid.

• Move through the shaft until you come to an elevator. Hop on the netting on the bottom of the elevator and wait for it to go up. When it stops, move through the shaft behind you to a nearby room. Kill the face hugger, grab the torch, and cut the lock on the ceiling panel (see pic, left).
• Climb up and move into the hallway. Move through the labs; look for a door marked "Surface Analysis Lab" (see pic, middle left). To the left of the door is a padlock on the ground. Use torch to cut it.

• Go into the airshaft and move until you get to a ladder. Take it down until you get to a gate with a green lock on it. Hit the switch and move through the gate.
• Hop down into the lab with the Predator. Hit the switch on the wall behind him, and then jump down the opening behind the PredatorÆs cell (see pic, bottom left). In the next room, look for an air vent above some containers. Shoot it and then climb through.

• Cut the next two padlocks. Move into the lab headquarters. After the mysterious watcher contacts you, grab the health, turn on the belt, and look in the nearby drawers for ammo and napalm.
• Turn off the specimen security. Go down the ladder and kill the two guards and any face huggers. Grab their flamethrowers. Crouch onto the conveyer belt. Make your way across the other side of the egg chamber to the hole in the floor. Swim down the hole.

• Get out of the elevator. Go left. Find the nearby ladder. Go down. Go through the only unlocked door. Clear out all the guards. (The flamethrower works best.) Cross the bridge to the next section. Go up the ladder. Find the lab with the lone technician in it. Take your hacking equipment by the window (see pic, right).
• Exit the lab and go left. Go down the ladder and then go left two more times. Kill everyone in the office you come to. Be sure to check the lock box for health.

• Return to the first level you entered ù the one with the bathroom and lockers. Open all the lockers; hack the ones that are locked (see pic, right). Grab the shotgun and the health.
• Look for the locking systems just outside the bathrooms. Open them up and hack them. This will unlock the personnel quarters. Search all the rooms for the ID card. Take the ID.
• Go left out of the room with the ID. Go up the ladder. Go through the hallway directly behind you. YouÆll come to another ladder. Climb down it and go to the left. You should be back in the office you were in a few minutes ago. The turnroom in the back corner will unlock.
• Go through the turnroom. It will take you up to an observation deck. Grab the CD on the corner and return to the turnroom. Clear out the office. Go right and then up the ladder. Go through the hallway and take a left at the elevator.
• After you escape the elevator, enter the nearby control room. Look for a panel on the wall that can be activated (see pic, right). Open it, go through. Hack the sentry-gun panel to turn on the guns.
• Follow the skybridges around to the service elevator. Take the elevator to the surface. Quickly climb down, grab your gear, and kill the guards. To use the rocket launcher effectively, be sure it is in "seeker" mode (green reticule) so it will lock on to targets.

• Follow the corridor around to the large room. Take the ramp down to level 2. Go in the only unlocked room. Cut the padlock; turn on the power. Using the crates, hop up to the upper level and flip the crane control switch. One of the lockers can be hacked for more armor.
• Look near the crane for an unlocked door. Go through it, proceed down the hall, and turn on the sentry guns.

• After the load screen youÆll get on a platform lift. Wait for it to stop. Lay down some flares and kill the incoming Aliens (see pic, left). As soon as the rush stops, look for a ledge behind the lift. ThereÆs a ladder that you can take up.
• Go outside and then into the unlocked door. Follow the path around until you come to some electrical arcs across the hallway. Go in the nearby control room and turn off the power.
• The easiest way to kill the Predator (see pic, left) is to go to the very end of the path, where he will face you on the ground. Use the heat-seeking rockets to take him out.

   "LOOSE ENDS"

• Follow the path around, killing anything that gets in your way.
• Go to the comm. center and get it back online. Grab the mini-gun.
• Go back to the landing bay. Some health is hidden in a vent near the entrance. Kill the Alien. Get aboard the dropship.

• Make your way down the shaft. Kill all Aliens. When you get to the elevator, look for an energy switch (see pic, right). The handle can be hard to see: just move your view around until the reticule turns green. Turn on the power, get in the elevator, and take it down.
• Kill all the Aliens. There are two mysterious generators. At the top of them are some struts that are preventing them from working. Destroy all the struts at the top of both generators (see pic, bottom right).
• Move through the double doors the generators open. Unleash missiles on the Aliens.
• Head on and look for a hole in the floor.
• After you get out of the exo-suit, head through the hive. Look for weapons lying on the floor around the queen. (Fighting her with the mini-gun is your best bet.) Once sheÆs dead, go out the hole in the wall opposite the one you came in. Haul ass to your dropship.

• Hop out the open window. Make your way to the ground. Stick close to the walls while you work your way through the streets. Sneak past the guards.
• Look for an open cargo area and the truck by its entrance. Behind the truck are some cats. Climb into their pens through a hole in the fence.
• After you eat the cats, kill the first two guys who discover you.
• Follow the path around, killing all the guards. YouÆll soon come to some animal pens/labs. Look for a hole in the ceiling of the second lab. In the top of the lab is a vent. Go through it (see pic, right).

• Look for a console at the end of a hallway. Smash the console to release your fellow Aliens. Exit the room and head down the elevator shaft that opens up.
• Kill the guards and move into the courtyard. Smash the door on the other side of the courtyard and move on.
• When you get to the open area with the two trucks on lifts, look below the trucks for a vent (see pic, left). Follow the vent into the adjoining room. Kill the two guards and look for the vent over the door. Enter it.

• The rest of this level consists entirely of moving through the ventilation shafts. Keep an eye out for grates that can be destroyed.
• To defeat the Predator, move down to the bottom level without letting him see you. Use your leap attack (default E) and then claw him. As soon as he dies, leave the room the same way you entered to avoid the explosion.

• Make your way through labs. Look for grates that can be destroyed on the ceiling. Destroy the control panel in front of the xenomorph storage facility (see pic, top right).
• After freeing the Aliens, go back outside the lab. Go through the door the guard comes through. Follow the path to a room with two sets of stairs. Go up the right one and look for a grate in the ceiling. Enter it.
• Follow the vents, killing everything in your path. When you come to a room with three Aliens floating in containers, kill the guards and then destroy the console that controls the crane. After the crane makes a hole in the floor, jump through.
• When you get to the bottom of the hole, destroy the nearby console.
• Continue through the hallways. Destroy the electric relay by the artificial hive. Move into the room with the scientists. Look for a metal plate on the floor. Crawl through it and then follow it up the shaft to the opening without a fan at the top (see pic, bottom right).

"PURSUIT"

• Make your way through the corridors, killing anything you see. Smash the electrical boxes on the walls to open doors.
• Look for fragile vents above doors (see pic, left). To destroy the large fan at the top of the shaft, destroy the three power generators at the bottom of the shaft.

• Climb up through the enormous elevator shaft. Look for the rusty vent at the top.
• Climb through the pipeworks and destroy the two hydraulics consoles. Make your way to the flight control room and destroy the telemetry relay.
• Defeat the two Predators the same way you beat the first two.
• Destroy the landing beacon in the room behind the platform.
• Destroy Dr. Eisenberg.