Codes for Duke Nukem 64
Provided by the Unofficial World of Nintendo
"Invincibility"
In the last boss, Cycloned Emperor, stand behind the football posts and you will not be harmed by his attacks.
In Overlord open up the side panel open the door and run back to the smaller side panel he will then follow you and you can shoot him and be unharmed.
Secret Levels
Area 51
Go to the level "Movie Set". Find the gates with the guard station outside the studio. There should be a locked door to studio 17C. Remember where it is. Now go back to the blue key-card door and open it. Go through the door, and continue to your right, opening studio doors until you reach the one locked by a red key-card. Unlock the door and open it, but don't go through. Instead, exit the studio and go back to the door for studio 17C. It should now be open, and there will be a movie set reading "Area 51". Go to the blue screen and push the red hand print. A small door will open in the corner of the stage. Duck down and go through the passage and you should reach a large door. Go through the door and walk past the green chambers, and you should find a GREEN exit. Punch the exit to enter the secret level "Area 51". It helps to do this in Deathmatch Mode, so you already have the keys and there are no monsters to worry about.
Duke Burger
To get to the secret level Duke Burger, near the end of Gun Crazy stand on the really small crate for about 2 seconds and a door opens up with the Nuke Button.
Lunatic Fringe
To get to secret level Lunatic Fringe, in Darkside after you teleport through the black stone/thing look up and left. Blow open the crack in the wall and jump through. Follow the tunnel to get to the Nuke Button.
Freeway
I have found a secret level called Freeway. To get to it, go to the level "Hotel Hell". Go to the pool on the second floor and run right through the waterfall. You will teleport to a rocky riverbank. Behind the palm trees at the far end of the passage is the secret level. Also in this passage is a small cave leading to an atomic health unit. You may not want to risk getting it because as soon as you get it, the whole place caves in.
Energy Refill
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.
Cheats
For the cheat menu, press Left, Left, L, L, Right, Right, Left, Left.
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.
To enable the "turn items on" cheat, push R, Right C, Right, L, Left C, Left, Right C, Right. (On the main menu, not the cheat menu!)
To get the invincibility code 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.
Note: When you do the configurations, a sound should signify that it worked, and when using invincibility you have to turn it off to get shrunken and do not turn the invincibility when you're shrunken, if you do get shrunken if you try to use the Vitamin-X or turn invincibility off you can't get big again and will have to reset the board by pressing Start and Select quit game or what ever it is.
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