Enter these codes at the Title Screen:

Cheat code:             Effect:
TOUGH GUY               Invulnerability
KICKASS                 Unlimited Bombs

Cheats Enabled:
     From the options screen press Esc to pull up the config menu. Now
type  the  word Phonebook and press Esc again. When you're playing the
game  pressing  0  on the top number keys takes you to the next stage,
pressing  3  gives  you  the bonus stages and holding Ctrl gives you a
super jump.