The most common cheat code in all the history of console gaming. Once the player had enabled infinite lives (AKA unlimited lives), the player could die as many times as they wanted and not have to worry about starting over. This was only really useful in the older console games that didn't have a save feature. Nowadays, it's pretty pointless.

Infinite lives wasn't always triggered by a game cheat code. It could also be activated through methods such as Game Genie, Goldfinger, Gameshark, and Action Replay. It was, and still is, quite popular.