MDK 2

Full pause screen
Press X + Y, while paused the gameplay.

Game music
If you insert your game disc in an Audio CD player, you can
listen the game music.

Secret images and sounds:
If you insert your game disc into a PC CD-ROM drive, you will find
lots of hidden images and sound in the mdk2 folder.

Slow Motion
Start a game as Max, hold R and press Up, Up, Up, Up.

Fart sounds
Start a game as Doctor Hawkins and press L + R + Left + A.

Kurt Wearing Only Boxers
At the Main Menu, hold L + R and press X, X, Y, X.

Crazy camera:
Hold L + R and press A, B, A, B while the game paused.

Panning camera mode:
Hold L + R and press B, A, B, A - while the game paused.

Mix Kurt, Max, and Doctor Hawkins characters:
Pause the gameplay, after hold L + R and press Up, Down,
Right, Left, A, Y, B, X, X + Start