Super Mario's Wacky Worlds. If the video we found at Unseen64 is any indication, it's likely for the better.
Created for the ill-fated Phillips CD-i by Novalogic, SMWW took Mario out of the Mushroom Kingdom (bold!) and plopped him in real-world locales like Egypt (puzzling!). Though touted as a successor to Super Mario World, it seems this would have been lucky to have been a successor to Hotel Mario.