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Secrets
Level 1 secrets:
1. Outside, jump on the crate, then jump over to in front of the billboard.
2. Jump on the crate, then jump up onto the sloped part of the building. Jump into one of the windows.
3. Once inside secret #2, go up to the poster at the end of the hallway and hit spacebar.
4.Once inside secret #2, turn the corner and jump out the window on to the slope. Mark Poole
5. Jump on top of the movie projector, and a wall will open up.
6. In the arcade, play the Duke Nukem game. A panel in the wall will open.
7. In the bathroom, jump on top of the stalls and go left. There's also a vent you can kick open.
8. Shoot the movie screen with the RPG.
9. Outside, behind the palm tree, jetpack up to the secret apartment. Rob Loggie
10.Use the cash register in the theater lobby. Look a little to your right, a secret door opens. You need the jetpack to get up there. Mark Poole
CORRECTION:You don't need the jetpack. Just hit spacebar under the secret. Richard Dean
11.Outside the back entrance to the theater, jetpack up the most you can go. Beware of turrets! Mark Poole
12.Go up to the trash can just outside of the Arcade and hit spacebar.

Level 2 secrets:
1.In the bookstore, hit spacebar on a bookshelf. The bookshelf is on the wall that you face when you walk in. Nic Pottier
2.Right before the elevator in the bookstore, turn right. Nic Pottier
3.Blow off the sewer lid (near the yellow key) with RPG or bomb. The same place can also be accessed in the bar's bathroom. Nic Pottier
4.Behind the counter in the bookstore, go to the corner and press spacebar. Doug Yoder

Level 3 secrets:
1.In the church, shoot the corpse hanging from the rafters. The corpse is a guy from Rise of the Triad
2.In the dark prison cell, hit spacebar near the bed.
3.In the rom with the hologram, you can go out a door and see a map. To the left and right of the map are secret ledges. Doug Yoder

Level 6 secrets (the secret level), all courtesy of Nic Pottier.
1.Underwater in the pool of sewer slime, go through the grate.
2.In the room with the light switch, use the jet pack to fly through the grating.
3.In the room with the switch that opens the doors to the launchpad, one of the walls opens (with spacebar).
4.At the bottom of the rocket, use spacebar on a computer.

Etc.
In general:
1.Most trashcans hold goodies. You'll have to use more powerful weapons to destroy the plastic cans. Mark Poole
2.Anything spewing water (a broken toilet, broken fire hydrant) will replenish your health if you keep on hitting spacebar.

Level 1:
On the bathroom wall, the phone number "867-5309" is written (This was a popular song in the 1980's).
Outside there is a billboard, referring to OJ Simpson, wich says "Innocent?"
Level 2:
In the bar, one of the TVs is showing a White Ford Bronco driving on a highway (another OJ joke).

Level 3:
Behind the cross in the church-like thing, there is the corpse of a "Doomed space marine."

If you know of any cool things, please mail me (I'll even give you the credit!).