Huge Treasure Chest Key

In Wario World, Wario must collect the four pieces of the Huge Treasure Chest Key (also called huge treasure box key or giant key ) to unlock the huge treasure chest that the Black Jewel has locked itself in.

Wario receives a piece of the Huge Treasure Chest Key after defeating each of the major world bosses, DinoMighty, Dual Dragon, Red-Brief J, and Captain Skull.