During play, type bod and press the minus sign on the keypad. This will enable cheat mode. Now type these codes followed by the minus sign on the keypad:

bing               Disable cheat mode
mrbenn             Level skip
zippy              God mode
bucketofchicken    Rear view

babapapa           Extra credits
crystaltips        Extra life
dunky              Instant high score
albertofrog        Grenade power-up

Thanks to Revolution readers Yoav Tibika, david hudson, and Kotsom!