Enter ICHEAT as a name. Then, press A, Right, C-Down, C-Right, C-Up,
A, Left during game play.
Weapons power-up:
Enter ICHEAT as a name. Then, press Down, Up(2), Z(2), Left, Right
during game play.
Surreal graphics:
Enter ICHEAT as a name. Then, press Down, Up, Right(3), A, Left during
game play.
Mutant alien:
Enter ICHEAT as a name. Then, press C-Down, Up, Z(2), C-Right, Right during
game play. Enabling this cheat while facing a harvester will transform turn
that alien into a mutant.
Fat legged aliens:
Enter ICHEAT as a name. Then, press Left, A, Right, Down during game play.
Additional difficulty levels:
Repeated press Left at the difficulty selection screen to access the "Very
Easy" setting or repeatedly press Right to access the "Very Hard"
setting.
Sites: