A sequel to Super Mario RPG: Legend of the Seven Stars, otherwise known as Mario RPG 2 and Mario RPG 64 while in development. Due to complications involving Square, it was reworked into Paper Mario and was released as a standard Nintendo 64 title.
A game called Ultra Donkey Kong for 64DD was sometimes referred in old gaming magazines, which is thought to be an early version of Donkey Kong 64. Recent investigations debunked the theory of it being Donkey Kong 64, but it is still unknown the reason for this game being mentioned.
A mysterious game that was being developed for the 64DD by a team at HAL Laboratory headed by Yoichi Yamamoto, a former construction engineer. While little is known of the game in its original form, it is believed that many of the game's features were later incorporated into Pokémon Snap, developed by the "Jack & Beans" team.
Jungle Emperor Leo was a 1997 movie based on the 1950's manga by Osamu Tezuka, Kimba the White Lion (incidentally, the inspiration for Disney's The Lion King). Nintendo secured the rights to develop a game based on the movie which was announced for the 64DD.
The game appears to have been an action-adventure title starring characters from the movie and manga, but very little footage of the game was shown, so details are scarce.
Mario Paint 64 is a canceled Mario game for the Nintendo 64DD which would have served as a follow-up to Mario Paint. Only a few details were confirmed. It allowed many processes when playing and the original mouse for the SNES game was scrapped. Instead, various other controllers were announced, but kept as a secret.
Mario Artist: Video Jockey Maker was one of the games from the Mario Artist series that ended up cancelled due the the Nintendo 64 Disk Drive lackluster sales.
Mario Artist: Sound Maker was one of the games from the Mario Artist series that ended up cancelled due the the Nintendo 64 Disk Drive lackluster sales.
Mario Artist: Graphical Message Maker was one of the games from the Mario Artist series that ended up cancelled due the the Nintendo 64 Disk Drive lackluster sales.
Super Mario 64 Disk Version is a prototype disk that was created for display at Nintendo’s Shoshinkai show in 1996, to help promote the 64DD add-on, but never received a general release. The game itself is only slightly different to the cartridge version that had been released in Japan some months prior, with an altered castle theme, the omission of the famous 3D Mario head and a couple of game-breaking bugs in Tiny Huge Land.