Vice: Project Doom Cheats

After entering the stage select code and selecting a stage, during gameplay push Right on controller 2's D-pad to increase the slow motion effect, and Left to decrease it.

Turn the game on, hold the A Button down and press the Reset Button. Press A or B on Controller 2 to bring up the Sound Test. Pressing Up or Down on Controller 1 will allow you to go through the Sound Test. Pressing B on Controller 2 will bring up the Stage Select Option.