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start moving around. Head back to near the entrance and climb the ladder.
Climb through the vents until you reach the part where the platform is moving. Jump on to it and into the vent on the other side.

Climb through the shaft and head to the left. Go upstairs and into the shaft. There's an ladder on the far wall, save before trying to jump. Make it to the top, there'll be a scientist hanging by his fingers. He'll die, but not by your fault.

Jump on top of the elevator, smash the floor until you find a panel. Jump through.

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We've Got Hostiles
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This area is annoying due to the fact that there are a large number of sentry guns, trip wires and trip mines. Sentry guns are best dealt with a double-barrelled shotgun, but preferably not up close.

Trip wires will set off these sentry guns, so be very careful. Be even more careful around the blue beams, they're trip mines. Touch it, you die. Be within 3 metres of it when it goes off, you die.

Take out any aliens/marines in an area with these trip wires, as they can set them off as well.

Creep past everything, blowing things up if necessary and jump down.
Next is a annoying area with sentry guns, a shaft which leads nowhere, and a wet floor. Be careful when you're going around the corner, you can easily slide into the shaft and die. Take out the sentry guns with the shotgun or grenades, then move forward.

Use the ladders to escape. In the next room, you'll meet the marines.
There, they kill off a scientist. While they're shooting, take the opportunity to take them out. I think you grab a MP5 from them. If using grenades, time them perfectly, otherwise the guys will run away.

Take the elevator out of here, then out the fire escape door, and onto the bridge/catwalk. Walk up the conveyor belt. Take out the sentry guns below. There's a sentry gun behind one of the doors.

Climb the stairs, then sit back and watch the marines vs the aliens for a while. Don't forget to join in! The marines are a tough enemy, they attack strategically, and dodge attacks, grenades, etc. Plus, they're good at throwing grenades, so watch out!

Walk up to the top of the room, head down the corridoor. Take out the marines before going down. Take the elevator up and get ready for one of the coolest parts of the game.

Outside, a plane will drop marines and more marines and more marines.
If you cheat or are REALLY good, you can take out the plane which drops them. Either way, make your way to the bunker in the middle, and go down.
Take cover.

Climb through the vents, and guess what? The marines drop down from here too. Sigh. Make your way to the bottom, CAREFULLY past the fan blades and take the vent in the far right corner to get out.

Now you can open the door to the silo. Head out.

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Blast Pit
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Make your way through to the elevator. Go up to the room nearby, and turn it on. Now head down on the elevator. There'll be a little train thingy there, jump on it and hit the USE key. Press up to accelerate, down to decelerate. Go at full speed to avoid the aliens. You'll hit a barrier and fly. Quickly get out of the slime and onto the platform.

Climb up the ladder, and makle your way inside the pipe. In the next room, walk on top of the pipes, and jump onto the platform. Use the elevator to exit.

When out of the elevator, there'll be an alien surrounded by explosive barrels. Be careful not to shoot the barrels, or you'll have a tough jump across.

Get through the locked doors. Before you enter the test fire place, take out any crates you can see. It'll make life easier. Here's a dilemma.
There's these Tentacles in the way of your escape. And the Test Fire switch doesn't work...so you'll have to power it up. The way to get past the tentacle is the walk, or crouch past him. Head to the second level from the bottom.

Smack the door open with your crowbar, then RUN the hell out of here, as the tentacles will hear and start going nuts. Walk across the bridge, go down the halls.

Smash open the sewer grate, and the turn left at the fork. Climb the ladder. Climb down below the big fan, the rush back as fast as you can to the ladder,climb back up.

Wait until the fan is spinning at full blast. Look up. See the boarded up roof? You're gonna break it. Either chuck a grenade up there (it'll reach, thanks to the fan), or jump in and smash it yourself. Either way is fine.

Once up there, smash the vent and climb through. It's squishy, so quickly make your way through and get to the Oxygen and Fuel room.
Turn on both switches. They're on when the fluid flows. Exit via the ladder and get back to the tentacle.

Now you just need to turn the power on. Creep past the tentacle to the bottom. Smash open the door, and run. Jump over the broken walkway, then go down the flooded corridoor.

Just in case, you may want to use all of the crates in the room ahead to make a bridge across the puddle, as when you turn the power on, it'll become electrified.

Watch out for the tongues, then go inside the elevator. Once it stops, jump out onto the ladder nearby. Otherwise you'll fall to your death.
Climb down. Walk around on the pipes to get to the platform.

Make your way to the power control. Here, you'll use horizontal transport machines to make your way through. Be careful of the one on the second level though, it's out of control. You've got to climb to the top thing and activate both switches on both sides.

Leave once you've turned the power on, climb back up the ladder and into the flooded hall.

Now's the time where you'll want to have placed out those boxes to get across. If not, climb on the big box near the end, and walk carefully along the edge.

Head back to the Test Fire control panel and turn it on. You'll get damaged a bit, but the Tentacles die. Jump down, and grab the magnum.
Jump down further, swim under the pipe/the missing pipe, and surface.

Walk to the pipes, and to the end. You'll have to do a bit of pipe- switching every now and then. Head onto the pipe at the end, with the grate. Be careful, use the wheel to get across.

A part of the pipe will be a different colour, it's gonna drop. So jump back before you break your back. Jump down, grab the health kits and move on.

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Power Up
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Don't waste a second: you need all the time you have. Rush past the monster and head into the tunnel to the left. The marines serve as a good distraction.

Head to the left, past the pipe, and then down the ladder, and down the corridoor, and up until you hit the red door. Open it with a wheel, then climb the tunnel to the top.

Head across to the other side, and then go left, heading towards the power generator. Once you see an elevator, which should be after the bunker sort area, and then drop a satchel on the elevator. Make the elevator head down, then detonate the satchel. You'll set off the mines down there.

Bring the elevator back up, then go down again. Take the stairs, all the way to the bottom, full off water. Go over to the power generator, then take out the box in the way.

Go back up, and to the fan control room. Turn the non-operational fan on, and then get back up to the place with the monster. But head into the door marked Track Control on top of all those boxes and ladders.

Jump out the window, and run for your life down the wide tunnel on the left. Make sure he's chasing. Go to the wall at the end, the far right hand corner, and whack the switch. The monster gets zapped, and you leave through the door.

Go back to the open area with the train thingy, then drive it onto the disc. Go into Track Control, hit the switch, and then the disc will spin. Head back onto the train, and go full speed into the barrier.

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On A Rail
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Stop to listen to what the guard has to say. Then he'll let you pass.
Be careful, don't touch the water or the rails, as they will both do damage to you.

Drive past the first switch, and when you reach the second one, shoot it to go straight forward. Slow down, and jump off at the stairs and the monster. Be careful, a sentry gun lies behind the crates so it's best to be prepared or to lob a grenade. Hit the switch and a hook, which was blocking your way before, will move.

Jump back on the train and head forward. Shoot the switch again, and you'll be taken back towards the hook which was previously in your way. Shoot the switch, so this time you go left instead of forward.

There'll be a gate, get off and hit the switch. Go to the end, and you'll have to get off. Combat the marines, then find the boarded up door. Inside is a guard who will help you.

Around the next corner is some sort of artillery, which is up against the wall and will start shooting at you if it sees you. It's no use hiding behind crates, so RUN when you turn the corner, jump next to it, and grenade the person who is inside.

Before heading into the blast doors, there's health on the things above it. When you enter, take out the mines with a grenade/satchel, and move on.

There'll be a train at the bottom of the stairs, but this time the ride is less than easy. There's debris falling from the roof and red trip wires which will trigger off the sentry guns.

Along the way, there'll be a rocket launcher shooting your way. The way I killed it was I ducked, and lobbed a couple of grenades in the marine's direction. You can also get off and go into blazing with your
MP5. The train will stop at a gate, press the button to get through.

You'll stop to fight at the next platform, jump over the blocks to your left to get to a switch. Raise the gate, then head back onto the train. In the next room, next to the gate, will be a swarm of marines. Get behind the machine gun and use it to your advantage.
Take out the mounted gun thingy with a grenade, then hit the switch next to it.

There'll be more than a few trip mines ahead, so you may want to just jump off the train and let it detonate them all, as the next gate isn't too far.

Duck behind the controls to avoid getting hit by all those projectiles.
There'll be a switch soon, shoot it so that you can keep on going straight, and then head down the ladder at the next gate. There's a sentry trip wire though.

There's a whole bunch of sentry guns, either head into the little side room and take them out with grenades, or simply use the double barelled shotgun.

At the end of the next tunnel is a mounted gun, and a tonne of marines.
Plus, there's a machine gunner. So take him out first, then make your way to the mounted gun by dodging, ducking and weaving. Kill the guy operating the mounted gun and the marines are yours.

There'll be more marines in the launch area, a safe bet is to sneak in with a crossbow. Kill the and enter the door. There's a tricky part involving red lasers and a lot of explosives, take care there. Use the box if you need to. Press the launch button in the control panel and there you go.

Leave, though the red lasers are still there, and then go through the doors which just opened.
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