RoboCop Versus The Terminator/Secrets

Developers' room: Invincibility (requires cheating)
Enable TurboCop cheat mode by pausing the game and pressing: (a sound effect will play as confirmation). Then go to the very left edge of the level, and jump as high as possible while holding. You will enter a room with a photo of the developers, and be granted invincibility for the rest of the game.

Developers' room: Extra lives
Note: Going through the room skips the rest of the Trainer level (including the boss) and resumes the game from the next level (Streets of Detroit).

Reach the top of a multi-level building with two enemies and a gun pickup on the roof. Jump as far left as possible from the left edge, and you should land on an invisible platform. Jump left again to be bounced up to a final platform (this one visible). Press to enter a secret room with extra life pickups and a photo of the developers.

Level 2: Streets of Detroit
After dropping down at the end of a long pipe you will end up inside a building; instead of continuing to the next railing (on the right), go left. You will be blocked by an obstacle, but you can jump over it — continue left until you reach the wall, and then press to enter the secret level.

Level 4: Toxic Farm
Note: Going through the secret level skips the rest of the Toxic Farm (including the boss), and resumes the game from the next level (OCP Office Complex).

As you descend the ladder after jumping over the first few flaming barrels, you can jump through the side of the large pipe with "Toxic" printed on it. Once inside the pipe, press to enter the secret level.

Level 5: OCP Office Complex
At the very beginning of the level, instead of going right, jump left, into the wall. Go through, enter the door, and keep going left until you reach another hollow wall on the left. Go into it and press to enter the Secret Streets Exit.

Level 7: Underground Complex


Note: Going through the secret level skips the rest of the Underground Complex (including the boss), and resumes the game from the next level (Underground Bunker).

After climbing down a ladder surrounded on both sides by rows of ceiling turrets, jump through a hollow wall on the left. Climb the ladder and go through the door to enter The Secret Remote Base.