Unlock Cheats
When you have completed the game ALL the following cheats can be activated at the 'Extra's' menu.
Duke 3D Freeze Ray:
Complete the game.
Grayscale Mode:
Complete the game.
Head Scale:
Complete the game.
Infinite Ammo:
Complete the game.
Instagib:
Complete the game.
Invincibility:
Complete the game.
Mirror Mode:
Complete the game.
More tricks, tips and cheats for this game are right here - Duke Nukem Forever cheats
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