Duke Nukem: Manhattan Project Cheats

Get all ten Nukes in each level on Hard difficulty to unlock the lightning gun (on level 1-2, you only need to find 10 of 11 possible Nukes). After beating the game, replay level 8-3. Go through the level without dying or reloading, and again get all ten Nukes. When you reach Robo-Duke's chest level, press up at the path near his right hand (your right), and you will enter a hidden area containing Wozma, the secret boss. It has a ton of health, but you have unlimited ammo.