Duke Nukem 64

At the title screen, enter any of the following codes:

In the cheat menu, key in R, C-right, right, L, C-left, left, C-right, right.

Enable the "Cheat mode" code. Press R, C-Right , Right, L, C-Left , Left, C-Right, Right at the main menu. In the UK version, press R, C-Right, Down, L, C-Up, Left, C-Right, Left. In the French version, press L, Left, Down, L, C-Up, Left, R, Left. In the Japanese version, press R, Right, C-Right, C-Left, L, C-Left, Right, Up.

Press Left(2), L(2), Right(2), Left(2) at the main menu to access the cheat menu. In the UK version, press Left, Down, L(2), Up, Right, Left, Up. In the French version, press Left, Down, L(2), Up, Right, C-Left, C-Up. In the Japanese version, press L(4), Right(2), Left(2).

First you need to enter the debug cheat at the press start screen, this is Up-C, Up, Left-C, Right, Down-C, Down, Right-C, R, A, B. Now start a multiplayer game with two or three players, not four. When you start use the spare pad to select a level and you will start a co-op game plus all the items will regenarate after a short amount of time.

Start a game in single player, co-op, or deathmatch mode. Enable all codes except for invincibility. Arm Duke with the plasma rifle or gun. Charge the gun to full power, then shoot it near a wall next to you or shoot the charged blast on the ground. Die, then quickly press Start and enable "Invincibility". Note: This must be done before the "Press Start" message appears. Resume game play as a darker almost ninja-appearing Duke.

Press Up, C-Up, Left, C-Right, Down, C-Down, Right, C-Left at the main menu. In the UK version, press C-Up, Up, C-Left, Right, C-Down, Down, C-Right, R. In the French version, press Up, C-Up, C-Left, C-Right, C-Down, C-Down, C-Right, C-Right. In the Japanese version, press Up, C-Down, Right, C-Left, Down, C-Up, C-Right, Left.

Destroy any water source, including fountains, fire hydrants, and toilets. Stand in the water and hold A to slowly restore energy. Alternately, stand in front of a toilet or urinal and press A.

This trick requires patience and an elevator that can be stopped in the middle of a call. Try it with the Spaceport elevator with the broken lights. Enter the elevator. Go to the bottom of the shaft and keep tapping A. The elevator should appear to bounce. After a while, your journey up the shaft should seem much faster than before. Keep pressing A and the elevator will appear to be stuck at the bottom and have limited room to travel. Press A a few more times and the elevator will move again, only this time it will appear as if it were rocketing out of then shaft. The walls will get blurry and after a while you will be in blackness. Note: You can return back down. This trick works with any elevator that can "bounce".

This trick is best done with two people. In multi-player mode, select the Warp Factor level. Make sure there is no Dukebot to get in your way. Go to the area past the yellow key door (the giant moving ramp). Take a right turn and open up the wall to reveal a switch. Shoot the switch then run around to the other side of the large pillar in the middle of the room (or use a second player to enter, then re-open the door). A wall should be open. When you take the elevator up, you should be in a secret space ship location. However, instead of taking the elevator back down, walk into the same elevator. There are two elevators in the space station, but only the one you came in works with the trick. Close the door behind you. Get directly next to the door and start the elevator. You should be stuck in the middle of the closed door and the elevator. Move toward the elevator. You should have suddenly appeared in the elevator, and it should have stopped moving. Press A to get it to move again. This time it will not stop, and instead go faster. Have the second player call it back to get it to stop. If you do not stop, you will get stuck and must kill yourself or restart. After doing this, use the warp pad outside the big pillar to get near the space tram. The door should be open and the tram should be stuck in space. You can move out there freely, but if you go too far you will be killed. Hitting the switch near the open space tram door resets the tram and the elevator.