Level 2 (where you start) ------------------------- Once you wake up, go into combat mode. Beat the nursebot, and kick it into the force bars. Pick up the logbook, and the hunk of meat. Go toward the front of the next cell down from you. (the blue guy's cell) Drop the hunk of meat near the entrance. After he grabs it, run in the cell. (waiting for the bars to flicker) While he's distracted, grab the logbook, and the fork. Beat the snot out of him, and grab the photo he drops. Go toward the end of the hallway, and try to open the large doors. Ok, you've just seen the panel short out next to the door. Use the fork on the panel to open it. The correct circuit sequence is: 4-3-2-2-1. Open the doors to the guard room. Push the red button on the wall once. Go up the stairs and examine all the monitors, turning off the force bars in every room that you have access to. (one of them you cannot shut off from here.) Now go down the stairs and examine the monitors in the little security alcove (there are 3 of them.) One of them will be have a damage report written on it, repair everything you can. Another one of them will be the remote for another nursebot. Access the controls, and maneuver the bot out into the hallway, and have it pick up the severed arm. Move the nursebot into the guard room (same room you're in) and position it so it is right in front of the access panel to the sealed door. Read through Cayman's (blue guy) logbook. In it you will find an access code which must be entered through one of the terminals on the floor. If the bot is positioned right, and the access code is correct, you will get a message saying "Insufficient weight to access door" or something similar. Step on the panel near the nursebot and open the door.
Once you enter the hallway, you will hear thumping -- there is a large guard robot lurking in the corridor. Run down the hallway until you see a doorway on the left, and run into it until the 'bot passes. Once the bot passes you, continue running down the hallway until you enter the cryo chamber (on the right.) In the cryo chamber, head toward the far side and you will see a button, and a valve/wheel. Push the button, and you will open a hatch. Then turn the valve. Now run back to where you first entered this room, and there will be a display to the left of the door. Look at it, and look specifically at chamber #1. There will be warning sounds saying "Chamber 1 is becoming unstable." Just keep looking at the monitor, and a Cyberraptor will break free of the chamber. Enter combat mode, and knock the Raptor unconcious. While it is out, turn off the valve, and close the hatch. Position yourself a little behind the hatch, so when the Raptor wakes up and you are fighting him again, he is standing on the hatch. Beat the Raptor again, and this time, when he snoozes, he should fall squarely atop the hatch. When he does, push the button to re-open the hatch. Once he falls in, and noises start coming from down there, turn on the valve again. Once it's silent, climb down the ladder.
Once down the ladder, run down the plank as far as you can go until you come to a spot where there are three holes in the walls. Push towards the right hand hole (tough to find the right spot sometimes) and you will climb up it. Now you're in the cell you couldn't access previously. Once the marine wakes up, beat the stuffing out of him and pick up everything there. (Especially the gun!) Now make your way back to where the robot is patrolling the hallway, and enter the little alcove again. (It's actually an elevator shaft) There is a small panel near it, push it to open the doors, and enter the elevator.
Level 1 ------- Now, you have two choices here -- you can try to pick these robots off one by one, or you can just make a break for it. Whichever you choose, once you exit the elevator, turn and run down either corridor beside the elevator. When you see the guard cowering, kick him around a bit, and eventually he'll tell you that he'll put the main gun back online. When he does, use the cannon, and destroy the dropship flying in. (You have to hit it the first time, then re-use the cannon, and shoot the second one that comes in as well.) Once you've done that, re-enter the elevator.
Level 4 ------- Time to make a little sidetrip. Now that you have the gun, take the elevator to level 4. The only thing to do here right now is secure the area for later. Once you exit the lift, destroy the robot, then re-enter the elevator.
Level 3 ------- Take the elevator to level 3, and destroy the robot lurking outside of it. Go down the corridor and take the first left-hand door. You'll get a rather lengthy cut-scene. Once it's over, grab the medical device from the floor. Also, get close to the panel on the operating table, and try to access it. You'll get another battery, which you can then switch with the one you have currently if it's running low. Leave the operating room, and enter the room at the very end of the hall. NOTE: This room may have a funky 9-square lock on it. (It might be this room, but I can't remember.) The goal is to have all the blocks lit up _except_ for the center one. This may not be the lock to this particular door, but at some point, you'll encounter this lock. Beat the marine up on the dais, and take whatever is left over. Examine ALL the panels here, as some of the information they contain comes in handy. Up on the dais, to the left is access for a pressure suit. Enter it, and you'll wear the suit automatically. From there, walk over to the far side, and down two short flights of stairs (one from the dais, one to another level down) Examine the panels, (VERY important! One of these panels has a 3-digit code you will need to shut down the reactor... and since it changes from game to game, well, just find it) and when you've gotten all the information you need, choose Icarus access from the panel. Beat the marine that's there. There is a battery in the front of the ship that you can switch off with. It is _very_ important to have at LEAST one useable battery here for later in the game. Walk around to the back of the ship, and pick up the alien artifact. Now, head back to the room where you got the pressure suit, and access the display panel with the forklift. Use the forklift, and get it out into the hallway. Drive the forklift to the _first_ door you saw when you entered this level. (Using the forklift's perspective, it would now be the furthest one down on the left.) There will be another door past that one, which will automatically open as well. When it does, you will see a robot guarding the entrance to the reactor. Drive the forklift into the bot, and both will go plummeting. Now (with the pressure suit on) leave the control panel, and enter the room you just drove the forklift into. There will be another guard outside the door, if you notice you don't have your gun anymore, well, do the enterprising thing and take his. :) Once you beat him, enter the reactor room, and take a couple pot shots from afar at the alien across the bridge. (Might I recommend saving the game right about now?) ***This is TOUGH*** You HAVE to hit him from this distance, because as soon as push the second panel (which opens a bridge to the reactor) you are on the clock. Once you hit him, access the bridge button, and run across it. He will start to follow you back across the bridge if: a.) you hit him once with the gun b.) you ran far enough up the screen Once you do those 2 things, he will start to follow you if you back up across the bridge. When he does, push the button that activates the bridge and send him on an unwanted base jump. :)
VERY quickly, re-access the bridge, and run across it. To either side of the main console are two levers, push them both, and then access the main console. Enter the reactor shutdown code, then hit shutdown. Doing this last sequence without beating the alien _may_ seem to work, but then try to leave across the bridge again. :)
Once the reactor is shutdown, you're ready to explore the outside world. Go back into the elevator, and head down to level 4.