Virtual Bomberman

Kaboom!: The Mad Doctor’s Revenge was an unreleased sequel to the original 1981 Atari 2600 game.

Donkey Kong Plus was an updated version of the Game Boy Donkey Kong. The only known difference between the original and Plus, aside from the graphics, was the addition of a level designer to be used through the Nintendo GameCube for players to create their own levels with. However, the game vanished the following year, and was replaced by Mario vs. Donkey Kong, with the level editor gone and the graphics replaced with pre-rendered graphics. However, the game's sequel, Mario vs. Donkey Kong 2: March of the Minis had this feature and took advantage of Wi-Fi Connection.

Donkey Kong Coconut Crackers is a canceled puzzle game for the Game Boy Advance and a Donkey Kong spinoff title. The game was developed by Rare Ltd., and was originally planned for a November 2001 release date. It was likely postponed ahead of time due to the forthcoming acquisition from Microsoft in 2002. However, the game was eventually converted into It's Mr. Pants, released in late 2004. Some of the planned modes included various challenges around Donkey Kong Island, challenges from Cranky Kong, and a multiplayer mode.

Chinese Game Boy Advance prototype by iQue. This cartridge was sent to the Chinese government for review when there was still a ban on video games. The game itself is a compilation of the Japanese "Famicom Mini" releases into a single cartridge. It was never released.

Originally, Ms. Pac-Man started as an unauthorized hack of Pac-Man called Crazy Otto by General Computer Corporation, featuring a Pac-Man-like character with a blue eye and legs. To avoid another lawsuit with Atari (which they had previously received for creating "Super Missile Attack", a Missile Command hack), G.C.C. presented the game to Bally Midway for approval of release. Midway, impatient for Namco to release the then-upcoming Super Pac-Man, purchased Crazy Otto for their own release, transformed into Ms. Pac-Man.

Return of Donkey Kong is a canceled Nintendo Entertainment System game whose existence is attested in Nintendo of America publications from 1987 and 1988. It was featured as an upcoming game in the Official Nintendo Player's Guide in 1987. Not much is known about the title aside from the fact that it was considered a follow-up to Donkey Kong, Donkey Kong Jr., Donkey Kong Jr. Math and Donkey Kong 3. The two blurbs describing the game suggest that barrel-throwing would return as a mechanic, and that Donkey Kong would appear as a playable character for the first time. No images were ever shown of the game and it is not known if Return of Donkey Kong ever existed past the conceptual stage.

Toon Panic was a multiplayer brawler / arcade fighting game for Nintendo 64, in development at Bottom Up. It was meant to be similar to Power Stone or Rakugaki ShowTime, but it was later cancelled because of bankruptcy of the studio.

Originally named Kirby Bowl 64, the Japanese name of Kirby's Dream Course, Kirby's Air Ride was one of the earliest games shown for the Nintendo 64. The earliest screenshots showed Kirby rolling down hillsides as a ball, but with the name change came a change in gameplay style: Kirby now raced around on Warp Stars. The game was shown over a number of years before simply fading away without an official cancellation. The game resurfaced in 2003 as Kirby Air Ride on the GameCube.