MDK 2: Armageddon Cheat Codes for Playstation 2

Kurt in boxer shorts
At the main menu, hold L2 + R2 and press Square(2), Triangle, Square.

Mixed character:
Pause, then hold L2 + R2 and press Up, Down, Right, Left, X, Triangle, Circle, Square, Square + Start.

Kurt in boxer shorts:
At the main menu, hold L2 + R2 and press Square, Square, Triangle, Square.

Panning camera:
Pause, then hold L2 + R2 and press Circle, X, Circle, X.

Mad camera:
Pause, then hold L2 + R2 and press X, Circle, X, Circle.

Slow-motion mode:
As Max, hold R2 and press Up, Up, Up, Up.

Fart sounds from Doctor Hawkins:
As Doctor Hawkins, press L2 + R2 + Left + X.