Joe & Mac - Cheats & Codes
Infinite Lives (European version) - Achieve a high score and at the name entry screen put "NESRABBIT" as your name. If done right your name will change to "B BUNNY" and you'll have infinite lives.
Credit to ReyVGM
Infinite Lives (USA version) - Achieve a high score and at the name entry screen put "DATABUNNY" as your name. If done right your name will change to "YO DUDES" and you'll have infinite lives.
Credit to ReyVGM
Level Skip (USA version) - Achieve a high score and at the name entry screen put "BUNNYEAST" as your name. If done right your name will change to "EXCELLENT" and you'll be able to skip levels by pressing Select.
Credit to ReyVGM