Duke Nukem: Total Meltdown Cheats
All Weapons:
Pause the game, then hold R1 + R2 + L1
God Mode:
At the options screen, press Circle, L1, Square, R2, Up, Right, Circle, Up, L2, Down. If done correctly, A God Mode option will appear.
Infinite Ammo:
Pause the game & press Up, Down, Down, Left, R2 + L2, then hold X & press Start.
Level Skip:
On the episode select screen press L2, Up, Square, Up, Square, Right, Circle, Circle, R1, Left. If you were quick enough, Duke will say 'Come Get Some' & after you pick your difficulty, a list of levels will appear.