Pray for Death

Bonus game
Type "meettheguys" at the Credits screen.

Faster game
Type "sendmefaster" at the Credits screen.

High-pitched announcer and cartoon sound effects
Type "toonsound-" at the Credits screen.

Underwater mode
Type "bloobabblooba" at the Credits screen.

GameBoy mode
Type "neednobatteries" at the Credits screen.

Fight as Pain
Type "greatwhiteguy" at the Credits screen.

Fight as Death
Type "wizardrules" at the Credits screen.

Unlimited lives (1P mode)
Type "eternalcoins" at the Credits screen.

Pong mini-game
Type "yeoldegame" at the Credits screen.