While sleeping in his castle, Wario is robbed by Captain Syrup and her reformed Black Sugar Gang. With his castle ransacked and his ill-gotten treasure stolen, Wario gives chase, determined to steal back all of his treasure.
This game is more puzzle-based, requiring Wario to use his powers to navigate the stages. Wario Land II introduces many new factors into the Wario Land series - such as taking on various roles when touched by enemies; secret treasures and stages; invulnerability; and so on.
There are two versions of this game available. The west received a Super Game Boy enhanced version of the game before the release of the Game Boy Color. This was followed by the Game Boy Color version later in the same year. Japan only received the Game Boy Color version.