- You'll start this level out in a small underground
tunnel. Make your way around to a steel beam and go up. Watch for the electrical wire
hanging overhead.
- As soon as you emerge, watch out for headcrabs. Jump
onto the small perimeter ledge, onto the catwalk, and around the next hallway.
- You'll emerge into a small, dark curved hallway
overlooking a large alien habitat. At the end of the hallway, you'll come to a locked
door, at which point aliens will teleport in behind you, breaking the glass. Kill the
aliens and jump through the broken window.
- Down in the alien habitat, there's an open doorway
leading to a small lift. Run as fast as you can and shut the door behind you if possible.
When the elevator rises, the door in front of you will open. Prepare to fight.
- As soon as you go through the doorway, a huge zombie
will come charging. Take him out, along with the headcrabs in the room.
- There are two doors exiting this room -- one is the
previously locked door heading back to the observation area. Take the other door.
- Go around the hallway and make your way to an elevator
shaft. Break the glass and climb in the elevator. Climb out onto the roof and then up the
ladder in the elevator shaft.
- At the top of the elevator shaft, drop to the small
ledge and look down. There's another elevator opening with a broken door providing a small
platform to jump on. Jump on the door and enter the upper hallway.
- Make your way around to a fork in the hallway. One path
leads to an elevator going down, the other leads to a door somewhat blocked by a yellow
construction sign. Take the elevator down.
- When you get off the elevator, make your way past some
rubble, through a doorway, and around past some aliens overlooking another alien habitat.
There's another doorway in the habitat floor -- shoot out
the glass, work your way around the ledge of the habitat, drop down and head through the
doorway. Activate the small lift there and go up.
- You'll emerge in a room with three glass tanks holding
alien specimens. The third tank is broken and the specimen is on the floor. This is
actually a weapon (it uses glowing green ammo you'll find growing throughout the rest of
the game) -- pick it up.
- Continue around, through another small curved hallway,
and through the doorway. Head through another doorway and take out the Houndeyes you meet.
After that, you'll arrive at a room with some glass panels overlooking a red room filled
with barnacles.
- Press the button in front of the glass and a hologram
of a scientist will appear. He'll explain that they've devised a grapple out of a
barnacle...but it will only attach itself to organic matter. (This, in most cases, will
appear in the form of the green alien ammo growing at various locations throughout the
rest of the game.)
- In the next room, grab the barnacle grapple from the
broken glass case.
- Continue until you come to a door marked "Specimen
Cultivation Room".
- You'll be confronted with a greenish room with alient
ammo growing all over the walls. You'll need the grapple to cross this room, but it will
be fairly hard with three aliens spitting acid at you.
- Kill the aliens and then cross the room, using the
grapple to attach to the alien plants. It would not be a bad idea to stock up on ammo at
this point - it will regenerate after a few seconds, so don't be in a hurry to leave.
- Continue through a red room with barnacles hanging
everywhere. Kill the headcrabs in the room, and then exit the room via the other side,
avoiding the barnicles.
- Through the door, you'll find another small lift. Take
it up and you'll run into a room with a few aliens. To the right are large doors leading
to an elevator leading upstairs; to the left are some stairs leading to a door and another
hallway filled with crates (and goodies). You can take the elevator if you want, but it's
basically a dead end with ammo and health to be found. Make your way to the hallway via
the door to the left, and outside to yet another habitat.
- This habitat contains two large tentacle creatures that
you really don't want to deal with. Use grenades to distract the creatures, and then walk
quietly (they track sound) around the ledge until you're out of harm's way. Look up and
you'll see a hole in the wall where a few more alien plants are growing. Use the barnacle
grapple to hoist yourself up and into the vent.
- Make your way through the vent and to a small room
where you'll find a small radio. Listen to the message and then throw the power switch
next to it. This will stop a fan blocking the vent exiting the room. Smash the vent, climb
in, and continue until you fall into the next episode.
Next: Pit Worm's Nest
