Mr. Tuff

Super Donkey is an unreleased platformer starring an unnamed proto-Rayman-like aviator/explorer who resembles the main character of Nintendo's earlier game Sky Skipper. Two builds were found, though neither one has any sound or music and the onscreen timer is non-functional in both. Judging by the name and some unused sprites, this might have been a Donkey Kong-related project. Various elements of Super Donkey would eventually be used in Super Mario World 2: Yoshi's Island.

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.

After the success of Star Fox, Nintendo decided to make a sequel on the same system. However, with the release of the Nintendo 64 looming close, Nintendo decided to cancel the game despite it being nearly complete. Many features of this game were later reused in Star Fox 64, most notably Star Wolf, and the game itself was later leaked as source code and compiled into a working ROM. The game was later released for the SNES Classic console as an unlockable game, marking its first official release. Since then, the game was also released for the Nintendo Switch Online service.

Originally designed for the Sega Genesis, then the 32x, and finally the Saturn, Sonic X-treme was meant to be the first fully realized 3D Sonic title. It was eventually cancelled in 1997 after spending a year in development hell.

Super Shadow of the Beast was going to be an enhanced port of the action-platform Amiga game Shadow of the Beast by Psygnosis. It was never officially released.

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".

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.

Reclaim Prince Dorin's Kingdom! Developed by Intelligent Systems, Dragon Hopper was largely complete and due for release in 1996, but went unreleased until 2026 as part of the Nintendo Classics collection. Due to trademark conflicts, this release was referred to under the name "D-Hopper" in English marketing materials, though the game itself retains its original title. In this action title, leap and fly across floating floors and defeat enemies blocking your path to advance. When you locate each of the four missing spirits, you'll be able to transform into a dragon that wields special techniques!