Bomb Island

The island, which is shaped like a bomb, has a secret cave which is underneath a giant rock. Move or blow it up when possible and enter in, there you will find a mini dungeon-like room surrounded by lava. There are plenty of Magtails as well as floor switches, so what you have to do is stun them and use their bodies as weights to keep the switches down. There's one switch once you enter in on your left, knock out the Magtail and place him on the switch, quickly run across the new path before the Magtail wakes up. Now you have two switches to press, one surrounded in fire and another surrounded in fire and behind another beam of fire. Like before knocks out the Magtails, the first switch is easy to get, but the second one requires you to have good accuracy with throwing objects. Once you get the switches, the last beam of fire is extinguished and shows a chest containing a Heart Piece.

This island is also one of the seven destinations of the Ghost Ship.