Huge Treasure Chest Key

Wario receiving one of the Treasure Chest Keys.

In Wario World, Wario must collect four Giant Treasure Chest Keys to complete the Massive Treasure Chest Key that will unlock the Giant Treasure Chest that The Black Jewel has locked itself in.

Wario receives one Giant Treasure Chest Key after defeating one of these four bosses: Dinomighty, Dual Dragon, Red-Brief J, and Captain Skull.