Campaign mode select
Press C five times at the player selection screen.
Level editor
Hold [Ctrl] and press E six times at the main menu.
Abort losing round
Immediately press [F10] if your character is destroyed to keep the round from being counted.
Bonus graphics
Enter the "data/sound" directory of the game to find hidden graphics of the game's programmer.
Bonus themes
Enter the "data/theme" directory of the game to find Windows 95 theme files for the game.