Duke Nukem 64

Secret Level Locations
Duke Burger: On the level Gun Crazy near the end when you are at the loading area of duke burger go into the office and through the vent as you normally would. Now when you get up to the area where the exit is jump on the first box you see. Next, look back to the ledge that you just jumped up to and the secret exit will be there.

Lunatic Fringe: On the level the dark side there is a monolith very close to the end, you will have to go through this if you want to go to the secret level or not. Once you are through, stay in the room where you end up. Look around for a crack in the wall, blow it up and the secret exit is in the room on the other side.

Area 51: On the level Movie Set, do the level as you usually would but when you hit the switch that opens the big door to the end, go the opposite way once you get back outside. Go all the way to where a new door has opened. In this room there should be a bloody hand print. Find it and a small hatch will open. Go in it (be carefull of the Alien Beasts) and follow until you reach the secret switch.

Freeway: On the level Hotel Hell there should be a swimming pool on the second floor. There is a water fall pouring into this pool. Jump into the water fall and you will be warped into a secret place in which the secret exit switch is hiding.

PAL Cheats
These are the cheats for the PAL (European/Australian) version of Duke Nukem 64.

Activate Cheat Menu - you have to be on the main menu, then press ( These are done on the control pad, not the control stick ) Left, down, L, L, up, right, left, up.

Invincibilty - R, C-right, R, L, R, R, R, left.

No monsters - L, C-up, left, L, C-down, right, left, right.

All items (including weapons and ammo): R, C-right, down, L, C-up, left, C-right, left.

Level select - R, L, R, C-down, right, up, left, C-up. To level skip, when you've got the level that you want on the screen, press start.

Hear Butthead's Voice
On the Duke Burger level in Duke Nukem, You must First find the drive thru sign on the outside. Then, all you have to do is got to the "Order Here" on the sign or go around to the center of the back and press A. This will play Butthead's Voice saying " Go away. We're like closed".

Level Select
L, L, L, Right C, Right, Left, Left, Left C

Elevator Trick
In order to do this you must have the shrinker and invinsability. First turn OFF invinsability and shrink the other player. After doing this put ON invinsability. Go into elevator. Go on seprate coners of the elevator, so one of you don't step on the little Duke. Now, while the big Duke is steping on the little Duke the little Duke will press the A button repeatedly. After a few moments leave little Duke alone and go back to your corners. If you did this correctly the elevator should be going up or down really fast nonstop. In a few moments the background should turn into rainbow colors. It will usually freeze after awille. Do this in Duke Match on the levels with elevators.

Living Dead Duke
Take a plasma cannon, and charge it up completely. Fire it at your teammate (you must be on Cooperative). While the screen is WHITE (not RED, or it's too late) press pause, and turn on invincibility, and Duke should be completely black. Now, if you want to be either a floating dead body or a "dying Duke" (yuck: he's vomiting blood and bouncing up and down), turn on the invicibility while the screen is RED.

No Monsters
Go to the cheat menu. Then hit these buttons in this order: L, LEFT C, LEFT, R, RIGHT C, RIGHT, LEFT, LEFT, RIGHT. You will here a siren if you did the code correctly. Then go in the cheat menu and now you can turn the monsters on and off.

Size Glitch
There is a way to play big or small in Duke Nukem. This code will work on co-op or deathmatch. To do this code in co-op you need Invincibility and items codes. Turn on friendly fire, then use the weapons code, shoot your buddy with the shrinker, or expander. Small Duke: Shoot, put on invincibility then turn it off again. The player will not grow back (the drawback: you can't have any weapons).

Big Duke: Get the expander, (with God mode off) and shoot the other Duke until he starts to expand. Just before he explodes put on God mode, stop shooting, then turn off god mode. You now have a giant duke that still can be killed. (Note, you may have to try it a few times to get it right).

Invincibility
To get the invincibility code players must first enter the cheat menu code ( Press the following at the main menu to access the hidden cheat menu: LEFT, LEFT, L, L, RIGHT, RIGHT, LEFT, LEFT. Now the cheat menu will be accessible). Then simply hit R button seven times in a row and then press left on the directional pad. A sound should signify that it worked. Now go into the cheat menu and turn invincibility on.

Fire walk
Safely walk on lava for a infinite amount of time by pressing the jump button enough that your feet arnt on the ground for more than a second. Keep it up and you can stay in lava without protection for as long as you want.

Weapon Warp
In Deathmatch, any weapon can be throwm into a teleporter to have it appear on the other end. Bullets, missles, grenades, plasma, it all goes through. You have to wait for the item to completly pass befor you can throw in another, ie- rapid fire bullets will not go through. This is great for droping gifts in for your opponents while you stay safe. Just be careful not to stand on a teleporter for too long, because if someone else steps on it, you'll get telefraged.

Turn Items On
Perform the code to access the cheat menu (from main menu: LEFT, LEFT, L, L, RIGHT, RIGHT, LEFT, LEFT).

Now at the main menu input: R, Right C, RIGHT, L, Left C, LEFT, Right C, RIGHT. This will enable all items to be toggled on or off.

Duke Nukem 64 Cheat Menu
Press the following at the main menu to access the hidden cheat menu: LEFT, LEFT, L, L, RIGHT, RIGHT, LEFT, LEFT. Now the cheat menu will be accessible.

Fountain of Youth
It's always fun to blow stuff up right? Well now you can have fun and get power at the same time. First, the fon part: Shoot or blow up a water fountain, fire hydrant, or even a toilet. Then: Walk over to the water that's squirting up and hold "A"{default} You will gradually regain your energy.