Tarzan

An unreleased platformer for the Commodore 64 based off of the Looney Tunes character Daffy Duck.

This is a cancelled version of Rayman for the Super Nintendo Entertainment System, for which the game was being previously developed. An early prototype was dumped on the internet in 2017, containing a short and simple level to showcase Rayman's abilities and animations.

Tom & Jerry 2 was a game that was being developed by Hi Tech. It appears different that the Genesis game, Frantic Antics. One can only speculate as to why it was canceled. It probably found the same fate as other Hi Tech games like Bobby's world, in which the market was too saturated for platformers based on cartoons.

Mickey's Playtown Adventure: A Day of Discovery, or Mickey's Playtown Adventure for short, is a 1994 video game published for the Super Nintendo Entertainment System. The game stars Mickey Mouse as he goes on an adventure in Toontown to solve puzzles and riddles involving letters, numbers, shapes and objects. The game was cancelled before it could be released, despite being finished.

A cancelled game based on the Popeye franchise. Given that Nintendo couldn't get the rights for the franchise, they transformed the game into "Donkey Kong".

Wile E's Revenge was the sequel to Road Runner's Death Valley Rally. In this game, you took the role of Wile E Coyote, and chased the Road Runner through various locations in the United States.

Alongside the production of Sonic X-treme, STI was working on another game only known as "Sonic Saturn". Rather than use sprites for sonic, though, it was going to use a 3D model for Sonic. This game was meant to have a more realistic rendition of Sonic's world than X-treme. It was never actually announced publicly that it was in production, but didn't get very far before being canceled.

A cancelled Kirby game for the Nintendo GameCube. It would be a 2D platformer with 3D graphics, and one of the features announced would be a 4 player co-op. Even though the game was never released, many of its features would later be used in new games in the series, like the graphic style in the Return to Dreamland and the co-op in Star Allies. This is the first of three different iterations of Kirby games that were cancelled around the same time. The other ones are an isometric-view platformer and a pop-up style 2D platformer.

Densetsu no Starfy for the Game Boy, and later for the Game Boy Color was a tentative Starfy title which was eventually canceled, though it was eventually released in the form of Densetsu no Starfy for the Game Boy Advance on September 6, 2002. Any initial plans of releasing Densetsu no Starfy for the Game Boy Color were abandoned in anticipation of the release of the Game Boy Advance.

New Super Mario Bros. Mii was an "experience" tech demo shown at E3 2011 for the Wii U. It is based on New Super Mario Bros. Wii and contains new levels, as well as the option for players to use their Miis. This demo was meant to demonstrate the "Off-TV Play" capability of the Wii U, allowing the player to continue playing a game on the Wii U GamePad without having to use a television screen. Players were able to play for up to ten minutes before the game would automatically reset. While the game was only exhibited to show gameplay experience using the controller of the Wii U, New Super Mario Bros. U is "based on" New Super Mario Bros. Mii.