Wario Land 3: Part 31: The Big Bridge (Green Chest)

To reach the Green Chest, cross the bridge and pass through a doorway guarded by Enemy Blocks. Use a nearby barrel to break the blocks, but avoid the fish. The Green Key lies in a doorway beneath the Green Chest's entrance; swim to it, then break additional Enemy Blocks, including hidden ones, in the next room. Access the Green Chest by winning another golf minigame featuring rough grass and bunker sand. The treasure inside is a Pocket Pet, a virtual pet that requires batteries to care for.