Duke Nukem 64

Begin game play on the Duke Burger level. Locate the drive thru sign on the outside of the building. Approach the "Order Here" sign and press A or move around to the center and back of the sign and press A. Butthead's will say "Go away. We're like closed".

Get a jet pack (located behind the movie screen) and go to the sign outside that is blinking. Fly up until you see the second black window up. Fly straight into it and inside you will find a large amount of guns, bombs, and sub-machine guns.

To become a huge invisible Duke, have a friend shoot you with the Plasma Shotgun, and enable the "Invincibility" code. You will become dark Duke. Now, have your friend shoot you with the Expander after disabling the "Invincibility" code. After you explode, enable the "Invincibility" code again.

When playing a two player cooperative game, turn friendly fire off. When you go to blow up an enemy, will be prevented from killing yourself.

In the second level (The Prison), you will find a cell with a bed and a toilet. Press the door open button on the toilet. A passage way will open up and you will find the severed torso of Kurt Russell from Escape From L.A. You will then hear Duke say "I guess he didn't escape after all."

Start a game in co-op or deathmatch mode. Enable the "All Items" code, as well as the "Friendly Fire" option. Have one player shoot the other player with the expander weapon. Enable the "Invincibility" code before the first player explodes, then disable "Invincibility".

Enable the "Cheat mode" code. Press R(7), Left at the main menu. A sound will confirm correct code entry. The invincibility option may now be enabled on the cheat menu. In the UK version, press R, C-Right, R, L, R(3), Left. In the French version, press L, R(2), L, R(3), Left. In the Japanese version, press L(7), C-Down.

Enable the "Cheat mode" code. Press L(3), C-Right, Right, Left(2), C-Left at the main menu. A level select option will now be available. In the UK version, press R, L, R, C-Down, Right, Up, Left, C-Up. In the French version, press L, R(2), C-Down, Right, C-Up, Left, Up. In the Japanese version, press L, C-Down, Up, R, Right, C-Left(2), L.

Press Up, C-Up, Left, C-Right, Down, C-Down, Right, C-Left at the main menu to unlock all options on the cheat menu. Note: If any codes are active, this code will disable them. 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(2), C-Right(2).In the Japanese version, press Up, C-Down, Right, C-Left, Down, C-Up, C-Right, Left.

Enable the "Cheat mode" code. Press L, C-Left, Left, R, C-Right, Right, Left(2), Right at the main menu. The sound of a siren will confirm correct code entry. Monsters may now be toggled on the cheat menu. In the UK version, press L, C-Up, Left, L, C-Down, Right, Left, Right. In the French version, press L, C-Up, Left, L, C-Down, R, Left, C-Right. In the Japanese version, press C-Left, Left, Right, C-Right, C-Left, R, C-Left, L.