Wile E's Revenge

Cheetahmen II wasn't completed and was never officially released. In 1996, however, 1,500 copies of the game were located in a warehouse, and eventually put on sale on the secondary market. All copies of the game were reused Action 52 cartridges, some with a small gold sticker reading "Cheetamen II". This cartridge is now very rare and hard to find, though numerous ROM images exist on the Internet. In Cheetahmen II the player again assumes the role of one of the three Cheetahmen (Aries, Apollo and Hercules); after defeating a boss at the end of the second level, they switch to the next Cheetahman for the following two levels, as in the Action 52 version. Due to a bug, it is impossible to get to the levels in which one plays Cheetahman Aries without altering the ROM image or experiencing a glitch that very rarely starts the game on these two levels.

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.

The fourth and final game in the SwordQuest series. Ever since the glorious history of this franchise with it's comics, merchandise, and competitions, the story sadly never got it's conclusion back then with the 3rd entry: Waterworld, being considered the last... until now! The Atari and Digital Eclipse Heavens have opened up to finally allow us to experience the 4th and Final Entry! Ascend into the the heavens in Swordquest: AirWorld! The game finally release 2022 as part of the Atari 50: The Anniversary Celebration.

Gex Jr. is a cancelled installment in the Gex series for the PlayStation. The game was developed by ImageBuilder Software and was pitched to Eidos Interactive. A prototype of the game was released online by justz00t on April 2nd, 2022.

This cancelled sequel to the beloved game was shown at E3 2005 by Majesco. The game was to feature 15 different jellybeans and 15 worlds. It was rumoured to be finished, but was never published due to Majesco's financial troubles. It was cancelled in August 2007.

An NES/Famicom prototype of arcade game The Fairyland Story. It was never released.

Black Out was a cancelled game which would be played using the SNES Mouse. A leaflet about it was included with the Japanese version of Mario Paint. A prototype (known as Sleep) was found in the Nintendo Gigaleak of 2020. It is a game where you help a sleepwalker traversing obstacles and shooting at projectiles. The game was made to be played using the Super Scope or the SNES Mouse. It has no sound and uses assets similar to those of Super Donkey (another prototype found in the Gigaleak, possibly related to the original Donkey Kong series) and Yoshi's Island. As a game under the name of Sleep was never announced nor rumored, even though the game was never shown before and having a different name in the dataleak, Black Out and Sleep they are likely to be the same game given the time frame and the use of the SNES Mouse. Both games are also related to Super Scope 15 (a Super Scope compatible cancelled game) in the dataleak.

Super Mario's Wacky Worlds is a cancelled Mario platform video game in development by NovaLogic for the Philips CD-i system. The game was designed to be a sequel to Super Mario World. While an early prototype of the game received positive feedback from Nintendo, the game was cancelled due to the declining sales of the Philips CD-i system.