The back of the box art.

Super Mario's Wacky Worlds was a failed attempt to become a sequel to Super Mario World. This unreleased game follows the classic platforming format as all the other Mario games. Developed by NovaLogic, only 30% of the game was complete before the game was canceled, due to poor sales of the CD-i console.

Although this game is unreleased, a ROM copy of the unfinished game is available online.
Wacky Worlds Ruins

A ruins area that could have been in Super Mario's Wacky Worlds.