List of unreleased media

Due to various reasons (ranging from being of poor quality, developing a game for a failed or soon-to-be-discontinued system, or the company facing financial or legal woes), a project can end up being canceled and cease production. Despite their status, concepts present in canceled games and other media can be reused in commercial releases, and some canceled games are repurposed into different projects.

A game in development can also end up becoming , a term for projects that are announced and for which development is started, but for similar reasons, were never published.

The following is a list of Mario media that has been canceled, or was never produced or released.

Low-information games and rejected pitches
This section lists rejected pitches (meaning ideas proposed internally or to Nintendo without seriously going into production) and canceled projects that have too little information to warrant their own page.

Archie Comics Mario comic pitch
Comic book publisher (which has published other comics based on famous video game properties including ' and ') pitched a Super Mario comic book series to Nintendo, but it was rejected. , as confirmed by writer. The concept art for the pitch was drawn by Archie artists and Ben Bates.

Boss Game Studios' Mario game pitch
Sometime during the late '90s, pitched a Mario game to Nintendo of America. The only known proof of its existence is a storyboard, drawn by Patrick Michael Clark, bought in an online auction showing Mario stepping on a wooden plank, following by the wooden plank sprouting legs and walking in Mario's direction. According to a Boss Game Studios employee, "The Mario thing I think was for a proposal. I’m not sure if we were trying to get the license from Nintendo to produce a Mario game, or if they approached us to do one. Either way, I think it died on the vine after they saw the concept art"

CD-i Donkey Kong game
A Donkey Kong game was in development for the Philips CD-i. The only known report of it is the LinkedIn resume of programmer Adrian Jackson-Jones, which states the game was in development during the 1992-1993 period at RSP. Jackson-Jones "designed and implemented the game engine" for the project. Jackson claims he worked on the game alongside programmer Owen Flatley and that he has no surviving assets left of the game.

Donkey Kong IV
Donkey Kong IV is a rumored final title in the original Donkey Kong series. The game is stated to have only been test-marketed in arcades, never getting a full release. It was only ever reported in issue #13 of Mean Machines magazine (October 1991), and was possibly the result of a misconception or confusion for another game (a likely candidate being Ocean's Kong Strikes Back!).

Donkey Kong Country 4
According to Rare employee Paul Rahme, it was internally suggested at Rare to make a new Donkey Kong Country game for the Nintendo DS, as remaking the trilogy for the Game Boy Advance gave the developers experience and a good basis for making a sequel. The pitch ended up not getting much traction internally and was dropped.

Donkey Kong parking attendant arcade game
In 1983, before creating the game show  and producing Hotel Mario, entertainment producer Steve Radosh was involved in developing an arcade game starring Donkey Kong as a parking attendant for Sega, as the company had rights to the property at the time. The game was canceled when, the American conglomerate which at the time was ' corporate parent, sold its ownership of Sega's U.S. assets to pinball machine maker.

Film adaptation of Super Paper Mario
Seth Gordon planned to release a film adaptation of Super Paper Mario, but has not had the opportunity to talk to Nintendo about it.

Mario Motors
Mario Motors was a pitch made by game designer for a Nintendo DS game. The game had players "shaving and sculpting out of a chunk of metal to make a cylinder [which then] decides the ability of your engines.". Saito also considered having the player blow in the DS's microphone to "learn how acceleration works" but scrapped it because the mechanic could have been too demanding for children. Despite initial interest from both Satoru Iwata and Shigeru Miyamoto, the project never got off the ground with Saito stating "I can’t tell you why, but please guess.".

Mario/Rabbids crossover adventure game
In 2010, Ubisoft Paris had explored proposing a crossover between the Mario franchise and its own  franchise. The game was conceptualized as a "subversive, self-aware take" on the Mario franchise and concept art was produced depicting Rabbids kidnapping Bowser as Mario chased them. According to an anonymous Ubisoft employee, the pitch was possibly rejected by Nintendo before it was formally shown. According to Ubisoft employee Davide Soliani, this attempt is unrelated to Mario + Rabbids Kingdom Battle.

Mario's Castle
Mario's Castle was a game announced for the canceled "Project Atlantis" portable system. The only known report of it was in an issue of the gaming magazine .

Mario's Mission Earth
Mario's Mission Earth was a canceled SNES edutainment game from The Software Toolworks, which would have likely been similar to Mario is Missing! and Mario's Time Machine. The only evidence of the game's existence is a brief mention on composer Mark Knight (who also worked on the SNES port of Mario's Time Machine) list of works on his personal webpage, which was later reiterated on a post for 2017 campaign. It is unclear how far the game got into development.

Sony Pictures Mario film
Internal emails leaked to the public by proxy of the 2014 detailed negotiations between  and Nintendo to have  produce a Mario movie. The email exchange between Avi Arad and Sony Pictures executive Amy Pascal showed photos of Arad meeting with Shigeru Miyamoto and Satoru Iwata; Pascal would later forward one of the emails to another executive with the comment "Avi closed Mario brothers" (Arad would later state to the press the deal had in fact not been closed after the emails were made public by the hack). Although no information beyond what is found in the leaked emails was made public, it seems the talks broke down as Nintendo would officially announce in 2018 that a Mario film would be produced by, an animation company owned by Sony Pictures' rival best known for the  franchise.

Mario Kart game
According to, a Mario Kart game that would be played on Tesla vehicles was proposed to Nintendo. Nintendo did not give them a license.

VB Mario Kart
The German magazine Big N claimed that a Virtual Boy installment of the Mario Kart series, tentatively named VB Mario Kart, was in development. The only known media report of it is Big N's August 2000 issue, which listed it among various other canceled Virtual Boy projects.

Wario Pool
In 2001, a Game Boy Color billiards game titled Wario Pool was pitched to Nintendo by veteran game developers Nick Pelling and Jeff Ferguson. The pitch was ultimately rejected, and the game was modified and released as 3D Pocket Pool instead. Nick Pelling later posted the mock-up intro to the game on his website.

Unreleased ports
These games were planned ports of already existing Mario titles to different consoles, which went unreleased for various reasons.

3DS version of Virtual Boy Wario Land
On December 15, 2013, independent developers Jools Watsham of posted a mockup of a colorized version of Virtual Boy Wario Land for the Nintendo 3DS. In a 2016 episode of IGN's NYC podcast, Watsham revealed that he had made a formal pitch to Nintendo to make colorized versions of Virtual Boy Wario Land and Nintendo's other Virtual Boy games for the 3DS, but the pitch was rejected for unknown reasons. He speculated this was because Nintendo did not want to remind people of the Virtual Boy.

Donkey Kong 3 for Mini Classic
A planned Mini Classic version of Donkey Kong 3 was in the works, but never got released. In a stock image, it is mislabeled as Donkey Kong Junior.

Donkey Kong 3: Dai Gyakushū for FM-7
An unknown video game company pitched an idea to Nintendo to port Donkey Kong 3: Dai Gyakushū to the. They purchased the rights and produced it, but it went unreleased.

Donkey Kong Jr. ZX Spectrum port
According to the July 1984 issue of Big-K-Magazine, Donkey Kong Jr. was going to be released for the ZX Spectrum that year from Atari, but it never came out. A prototype has yet to be found.

Enhanced Donkey Kong and Donkey Kong Jr. ColecoVision ports
In the early 2000s, incomplete prototype versions of Donkey Kong and Donkey Kong Jr. for ColecoVision were discovered. Both cartridges actually postdated the ColecoVision releases, and were seemingly ports of the versions from the Coleco ADAM computer, which featured more levels and cutscenes. The games were re-compiled into hacked ROMs titled "Super DK!" and "Super DK Junior" respectively; the unaltered ROMs were never released.

Mario Bros. Apple II port
Mario Bros. was ported to the Apple II in 1984 by Atari, but was never officially released. Despite this, its code was leaked (possibly by an actual Atari employee) and was widely distributed in the 1980s via piracy. There was even a bootleg Russian arcade version of Mario Bros. based on the Apple II prototype known as Kuzmich-Egorych (Кузьмич-Егорыч).

Mario Bros. Atari 8-bit port (1984 version)
In 1984, Atari planned to release Mario Bros. for their Atari 8-bit computer line (400/800/XL/XE). This port was identical to the previously released Atari 5200 version of the game. For unknown reasons, the game was canceled despite being fully finished. Mario Bros. would eventually receive an Atari 8-bit release in 1988, but this port was completely different than the 1984 prototype.

Mario Bros. Commodore 64 port (1984 version)
Yet another Mario Bros. port that went unreleased was the Commodore 64 version, once again planned for a 1984 release. This version was to have been published by Atari, but was developed by two programmers from Designer Software. A completely different (and rather bizarre) port for the Commodore 64 would later be released by Ocean in 1987.

Other Atarisoft computer ports
In several magazine publications, an advertisement from Atari was run stating that Mario Bros. and Donkey Kong Jr. would release for the Commodore 64, IBM PC (DOS), and Apple II. None of these ports were ever released, but as aforementioned, the Apple II and Commodore 64 versions of Mario Bros. have been found. The flyer also lists several never-released ports of Crystal Castles, Typo Attack, and Track & Field.

Super Mario Bros. Firebird pitch
In the 80s, a company called Firebird pitched an idea to Nintendo to port Super Mario Bros. to the Commodore 64 and got the rights, but production never got finished.

Super Mario Bros. Orpheus Software pitch
In 1986, small subsidiary developer Orpheus Software planned a short, one-level demo of Super Mario Bros. for the Commodore 64 and attempted to pitch it to Nintendo for an official release, with Nintendo later rejecting the project. A Lemon64 thread from 2005 claims that user NYCeguy24 may have owned a copy, but this is likely speculation.

Super Mario Bros. 3 id Software pitch
In 1990, in its infancy, video game company id Software pitched a demo of Super Mario Bros. 3 for the PC to Nintendo in the hopes of porting the game to personal computers, but Nintendo rejected this pitch.