Enter these on the password screen for the desired effect. Grid order from Left-to-Right, top-to-bottom.
The password grid will turn blank again if they're entered correctly (with exception to the Level Skip cheat).
After entering any of these, either choose "BACK" to go back to the title screen and start the game normally, or enter a proper level password.
Note: The "Limited Invincibility" cheat will make you invincible to most hazards except for spikes, bonfires, Pinky & Brain's "vacuum tuba" device in Stage 3, and "Instant Kill" situations.
|Space, Yakko, Dot, Yakko, Dot, Dot, Yakko, Dot, Yakko||Limited Invincibility:|
|Space, Space, Dot, Dot, Dot, Wakko, Yakko, Yakko, Yakko||Unlimited Lives:|
|Space, Yakko, Dot, Wakko, Dot, Dot, Yakko, Space, Yakko||Unlimited Time:|