Cheat mode:
Enter KANNIJADE KREW as a name on the high score screen to enable invincibility. Additionally, press the Top L + Top R to select a starting level.

Cheat mode (alternate):
Type FLEV17 and press [Enter] at the title screen. The screen will flash to confirm correct code entry. Begin game play to have unlimited lives and press the various function keys to advance to different levels.

Evil mode:
Enter MARY WHITEHOUSE as a name on the high score screen. Polar bears and civilians may now be killed while playing the game.