Super Dog Booby

Splatterworld: Rick to Kyoufu no Daiou is an unreleased sequel of Splatterhouse: Wanpaku Graffiti for the Famicom. A prototype of the game leaked online on 4Chan in October 2025.

DoReMi-ya Original Sound Witch is a SoundLink compatible game for the Satellaview from the Milon series.

Ultimate Mortal Kombat 3 Wave Net (an abbreviation for Williams Action Video Entertainment Network) was a planned network version of the game that allowed for online multiplayer matches. Notably, it is the only arcade version to feature Noob Saibot as a playable character. It was tested only in the Chicago and San Francisco areas that used a dedicated T1 line, connected directly to Midway's Chicago headquarters. It is highly unlikely that any Wave Net test games were ever released to the public after the infrastructure was dismantled, and so there are no known ROM image dumps of this version. One of the reasons this version was not widely adopted was the cost of T1 lines at the time: the setup cost several thousand dollars per arcade installation, plus a few hundred dollars for each cabinet using the hardware. Williams' plan was to use WaveNet to upload new games and game updates, which they would provide to arcade owners for free in exchange for a cut of the games' revenues. The Wave Net version ultimately received its first full release as part of the Mortal Kombat: Legacy Collection compilation in 2025.

Ookouchi Gengorou Ikka is a cancelled simulation game for the Nintendo 64. The game was not ever officially announced and it's existence is only known through a prototype build that was shown off by Game Tanteidan, a retro game store based in Nihonbashi, Osaka, on their blog.

Dragon King: The Fighting Game was an unfinished low budget 3D fighting game, and was the first in a planned series of fighting video games. The game was developed for the Nintendo 64, where it was to make unique use of the joystick on the controller. After deciding to use Nintendo characters to give it a more proper atmosphere on the Nintendo 64, the game later became Super Smash Bros. In 2022, Masahiro Sakurai presented in his own YouTube Channel some footage of the game, with the official title localization of "Dragon King: The Fighting Game".

CyberVirus is one of the most highly sought-after “lost” games for the Atari Lynx. Songbird acquired CyberVirus (along with Ultra Vortex and Mechtiles) from Beyond Games over two decades ago. Finally, a first person shooter game for the Atari Lynx! CyberVirus puts you in the role of the last surviving member of the Demolitions Ops Guerrillas (or DOGs) of War. You’ve got to stop the horde of bio-mechanical nasties that are threatening mankind with extinction! Features: Sixteen brain-frying missions Realistic 3D first-person perspective and motion, similar to BattleWheels Multiple weapons, including laser, grenades, and mini-missiles Wide variety of terrain, from the jungles of Central America to the deserts of Southwestern USA Plenty of foes, including bio-robots, mutant spiders, land mines, turrets, and more! NEW! Stealth armor NEW! More cheats than you can shake a stick at! Originally developed by Beyond Games, the title was abandoned due to the Atari Lynx lagging sales. The title's code and assets were later sold to Songbird Productions, who later completed and published the title in 2001, releasing the CinciClassic Edition in a limited 25 copies. Later in 2018, Songbird released a wider release on the standard title.

Seisho 1999, also known as Bible 1999, is an unreleased RPG game that was in development by Imagineer / Wavejack for the Famicom.

Clueless Fashion is an unreleased video game made for the Nintendo DS, intended to be a tie-in for the 1995 comedy film Clueless. The game was developed by Glyphic Entertainment and was set to be published by 505 Games. The game was possibly intended to be released in Europe on February 26th, 2010, with no other planned releases being known (though the game is rated by the ESRB, meaning that a North American release was also likely intended).