Metal Slug 3 Cheats

Cheat: Extend lives for Player 1.
Here is a boost in lives for a single player. On your last life before you die, press start on controller 2. This will allow you to continue playing with a new set of lives. Works only once per game.

Unlockable: Levels
Complete the game to unlock Storming the Mothership amd Chubby Isle Paradiso.