The Simpsons - Bart vs The Space Mutants
The Simpsons - Bart vs The Space Mutants -- Template:AL-Ocean
On the title screen, while the family are watching TV, type in COWABUNGA - you have to be quick though as it doesn't stay on this screen for long periods of time. If you get it right, you're now invincible and have an infinite time limit.
Alternatively, type in EAT MY SHORTS to skip levels.
(can someone check if this level skip one works *after* the main cheat is entered or if it's used at any time during the game?)