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Apprehension
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The train, simply, does not stop. Go down with it, and swim over to the locked up barrels. Open the lock and they will float up, creating stepping stones. Go up there and make your way across.

Walk around, and when it seems like you have nowhere to go, dive in the water and find the exit. It'll slope, and you'll probably lose some health. Don't worry though.

In the room with the tongue monsters and the cage hanging from the middle of the ceiling, move around climb up the ladder. A scientist will be there. Go onto the cage, switch to the crossbow and fall. Use the crossbow to take that thing out. If you're too scared to go under water,use grenades or satchels and piff them in.

Get out by smashing the cage, and getting to the wheel which turns the grate. Make your way to the door you didn't go into before, and then go up the stairs.

The platforms in the next area will break sometimes, so be careful.
When you hit the grate, you can either jump past the wire, or jump in the water and swim around. Be careful, you may lose health either way to the wire or the monster swimming around.

In the next area, turn the pistons on, and jump across to the other side with them. Otherwise, climb down, and go over to the other side. In the corner should be a ladder, use the boxes to get up there.

Kill all of the things in the room with the shelves, and the scientist will ramble about nothing in the cold room. So, when you reach the cold room, run right, left and right again. You'll reach a ladder, go down.

Now you'll talk to a guard, but he'll die...and in come the, um, foxy, female assasins. We'll just call them assasins. They're fast, and annoying. There are three of them, and a good bet is to use your crossbow to snipe them. You can also lay satchels out and lure them to it.
Another option is to go one-on-one with a double barrelled shotgun, but it's not recommended.

Go up the ramp, use the wheel to open surface access. Now save. Enter the door, and there's a darkened room. If you go in...BOOM! Lights out for you, you just got captured by marines. As far as I know, you can't stop this happening, and it's annoying as you lose all your weapons.

You'll be dragged somewhere, and it's to a trash compactor!!! Climb up the boxes before you get flattened. Find the crowbar on the other side, smash the grate below and escape.

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Residue Processing
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Head through the outdoors, to a big tower. Use the wheel and climb the tower. Exit via the pipe. Now climb up the edge of the vat thing, clmimb across either by the pieces of crap in the middle or along the edges. Leave via the pipe, and do this until you get to a room full of vats, and "plungers".

Jump from plunger to plunger to get across. Take the pipe out, then soon you'll fall into a processing area. Keep going through, and ducking under everything. Soon, you'll come across some conveyor belts and a control room to the side. Flick all three of them up, then find the real control room and hit the switch. Quickly run up the belts and under the plunger thingys.

You'll have to get through an area where these things are trying to squash you. Study the pattern and venture on.

Soon you'll reach a part where you'll have to drop from conveyor belt to conveyor belt. You'll eventually reach a part with two belts next to each other, one leads to the start and one leads the way out.
Take the one on the left, but be warned, some idiot placed trip mines inside the tunnels.

You can shoot the first one, but the second one is around a corner.
Drop a grenade or satchel on the belt, and let it go around before detonating it. It should take about six seconds to reach the point.
Then follow your path to freedom!

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Questionable Ethics
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Well, not yet. You'll have to contend with marines and big, fearsome enemies here so watch out. Head straight down the stairs, and into the room with a big baddie in a glass chamber and a control switch. Hit the switch, turn around and blow the thing to hell with grenades, preferably the ones with your MP5.

You'll come across a room with a "headcrab farm" in the middle, don't bother wasting ammo on them. Run into the control room, and hit the switch to electrify them. You can also do this for the next room but you'll have to lure them out.

There's more than a few trip mines, especially in the marine v monster rooms. Let them take each other out, then you clean up.

You'll reach an area where you have to turn on laser beams, there are four. Be careful of the one that is blocked, as it will blow up due to some dumd guard who can't use a Gauss gun properly.

Head to the middle area which says Do Not Obstruct Shield. Naturally, you want to, so push the crate right up against the wall, and so when the shield comes down it will hit it. Then flick the switch and watch the laser eat the wall.

Exit via the big hole, and then take the pipes on your way down. You'll find some scientists, tell them to stay put and then turn the cutting thingy off. Then grab the scientists and make your way back to the main lobby where they'll open the door for you.

Be careful, on the way ou there's a marine and a few sentry guns, outside on the roof.

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Surface Tension
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Run to the bridge with the chopper and the mounted gun. Dive into the water and climb the tower. Use the switch and it will make the gates underneath the damn/bridge accessible. Watch our for the thing in the water though. And the helicopter, marines and mounted gun. If you really want you can take all of them out (including the helicopter, use the Gauss gun if you really want some fun). Then swim underneath the dam to the other side. Use the red wheel to turn open a gate.

Climb the ladder there and walk through the pipes. Then climb up the ladder on the wall of the next building, creep around the edge and climb up the next ladder.

There'll be another tentacle monster, rush in and out if you want to pick up his stuff.

Next area is a mine field. Sheesh. You can shoot the ground in front of you if you want to detonate the mines. Head to the red wheel, use it and cilmb down the ladder in the storm drain.

Here's an awesome part. Climbing around on a cliff face, with narrow ledges, enemies, and if you fall, you're dead. Snipe the sentry gun, and any marines you can see. Then carefully, carefully make your way down.

Another chopper will be around, take it out or ignore it. Carefully walk across the breaking bridge. Next, you'll reach a structure which slopes upwards. In the alcove above is a marine.

Climb up the ladder, taking lots of care, then find the steps on the wall and make your way up, and up again to the pipes.

Next is a nerve-wrecking part. You'll climb a ladder to face millions of marines. So chuck a grenade, then pop back in and head around to the other ladder, and continue this process to kill them.

The tank is taken out with rockets, or you can sneak behind it and roll some satchels/grenades under there.

There's another tank after you open the gate, it's hard to kill but use the same tactics. In the hole in the fence, there's supplies and marines below.

The next area introduces the alien spacecraft, and those big, bad monsters have found their way outside. Be cautious when walking around this map, as up in the windows, there are snipers. Take them out with grenades from your MP5. There's also lots of mines too.

Go around the building, under the barbed wire and take out the barrels.
This should stop the power and allow you to climb to the roof. Find the hole in the roof and drop down onto the crates.

Now this part is tricky. DO NOT TOUCH THE TRIP MINES unless you want to run around in the Black Mesa Crater Facility. Touch one and the whole damn place goes ka-boom. Use the crates to help you, but don't touch the trip wires with the crates.

Reach the first door, and go in, make you way out through the window and take care of the enemies before they set off the mines. Go to the control room, shoot the crate on the elevator next to the room and make the elevator go up. Then take it down, and jump into the middle. Take that elevator down and get out of that place.

Be careful of the air-raids, but the aliens will get killed by them.
The tank here is easy to get past, but it helps to take it out. Run to the right of the building, and enter it. Find the guard and save him from the marines. He'll open up a room  full of goodies.

Climb out the window on the seond level, and walk along the edge until you can jump onto those green boxes. Get across and then climb the ladder to the destroyed building. Below are many marines, kill them, then find a way to get across the debris.

Oh, another chopper. Make your way to the right. There'll be a gun, use it to kill off anyone around, then blast open those big doors just to the left of your vision.

There'll be plenty of the big baddies around that area, so use your MP5 and grenades. You'll soon reach a machine gun, use it to clear out the swarm of aliens which will appear. The best way to do it is to duck and keep swinging it from side to side. This will take about five minutes 'cause they keep on coming.

See that crater thingy? It's a bounce pad, bounce up to the roof, and peek over the edge to watch a marine vs enemy match. Make sure they don't see you, and do the cleaning up. Head into the vent in the corner after they're finished.

You may come across some small, crawly thingys in the vent called snarks.
They're hard to kill, but they detonate within 20 seconds. Who cares, just head through. The next area will have you under attack by the marines, and they've used an extremely cool effect where they're shooting through the vents. You can drop down and kill them, or back up a bit, and drop snarks down there to kill them

Exit by the door on the right. If you take too long, it'll become blocked.
Use the car lift thing to get you up there, and jump out via the big hole.

Jump behind the gun, blow open the door and anything behind it. In the next area, there'll be a broken section of the platform, but you can get across it-with two jumps.

Get up to the roof via the crater and then open the pipe. Watch out, a marine will throw a satchel in there, quickly back up. Then head out, kill him and go upstairs to reach a guard. You need him to open some doors, so head to the bottom, open that door, open the next door, then you'll be back out where you were before. Get him to open the door in the control room.

Beware, there's a HUGE monster after you, so once you see him, run in the opposite direction without stopping. Come to a crater and then jump up to the pool. Climb up to the platform with the radio and controls.
There's a map, you've gotta position the the mark of where the lines cross right near the entrance. Then wait for the monster to come, and bomb him with the middle button. Once he's dead, take out these targets:

The tower to your northeast

The right wall of the "castle". You know, next to the moat.

The grating inside the "castle"

Now head over to the "castle".

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Forget About Freeman
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The ceiling falls very raipdly in this area. So head through the area dodging the falling pieces and climb up the debris to get through.