Wario Land II

Wario Land II was Wario's reclamation of his treasure from the Black Sugar Gang.

History
At Wario's personal island and castle, the Black Sugar Gang infiltrates the castle while Wario's asleep; they steal his treasure, flood it, leave a vicious snake in his cellar, and annoy him with a very loud alarm clock.

Because of how multiple choice-centric the story is, it's difficult to place which one is the correct story. But in a broad sense; the Black Sugar Gang are defeated and Wario gets his treasure back after a fight with Captain Syrup or a large Pirate Goom.

Later on, Wario infiltrates Castle Syrup to then steal the gang's treasure. He manages to nab it and escapes while a giant spear guy from the Black Sugar Gang chases after him.

Timeline

 * Wario is living in his castle, which places this game after Wario Land: Super Mario Land 3.
 * The Black Sugar Gang take revenge on Wario for what he did to them in Wario Land: Super Mario Land 3.
 * Hen appears here for the first time.
 * One of Wario’s stolen treasures is a Megavitamin, placing this game after their creation in Dr. Mario.
 * Wario only has one Megavitamin here and considers it a treasure, likely placing this title before Dr. Mario 64 and WarioWare, Inc.: Mega Microgame$!
 * One of Wario’s stolen treasures is a Viking Helmet from Virtual Boy Wario Land, likely placing this game after that title.