Super Mario's Wacky Worlds was a planned successor to Super Mario World, developed by NovaLogic for Royal Philips Electronics's unsuccessful CD-i system. The game was never officially released although three prototype copies are in circulation.

As it is a pre-alpha, the prototype is rather limited; Super Mario can only walk both ways and jump, and no Power-ups exist. He cannot slide or swim, but it would appear that these abilities would have been implemented had development continued. Enemies are also not programmed correctly; they disappear when Mario ends up above them, suggesting incomplete stomping attempts. Enemies also cannot harm Mario and are stopped in their tracks if touched, even if it means ending up floating in the air.

Level progression is not explicit, but can be pieced together by the selectable stages. Most worlds have two or three levels, the first of which end with Warp Pipes (or similar things, such as the Trojan Horse in Greek 1), whereas the last most often has a stylized "M" object holding tape, presumably a similar aspect to the Giant Gates, but ending worlds instead of levels. However, the mysterious "M"s may serve another purpose, as one is found alongside a Warp Pipe in Igloo 1; perhaps they would have signified bonuses.

Both "M" marks and Warp Pipes are non-functional, so one must restart the CD-i or emulator to escape a level.