There exists an extremely early test prototype of Disney's Lilo & Stitch 2: Hänsterviel Havoc that is simply just a compilation of a platforming level from Ed, Edd n' Eddy: Jawbreakers and a racing level from Hot Wheels: World Race as a proof-of-concept that both styles of gameplay could fit in a single game pak. The only element of Lilo & Stitch that exists with in the game is Eddy's sprite in the Jawbreakers segment being replaced with Stitch.
The existence of Sonic's Edusoft was first exposed to the public not with a prototype release or old magazines, as most cancelled games come to be known through, but rather a mysterious, unsourced Wikipedia article with a single screenshot. The combination of the article's lack of quality and the sheer quality of the game's graphics for a Master System title made many believe it was an elaborate hoax, as was common on Wikipedia at the time, up until an anonymous programmer for the game visited the Sega Master System fan forum SMS Power! and provided further information and screenshots, before privately giving Sonic fan wiki Sonic Retro access to the ROM, confirming the game to be real.
Nintendo planned to release the 64DD in North America and even manufactured test units with fully translated BIOSes and functional region locking. However, the idea was ultimately dropped due to the add-on's low sales in Japan. Concrete proof of these plans wouldn't become public until 2016, when YouTuber Jason Lindsey (a.k.a. MetalJesusRocks) found a surviving test unit and verified its legitimacy with former Nintendo of America employee Mark DeLoura.
In the Japanese version, and prototype US builds, of DuckTales, the ending line of the game was the grammatically incorrect, and arguably out-of-character, Scrooge line "There really is more important treasure than this, that is... dream and friends", which was changed to "I couldn't have done it without you. I really am the richest duck in the world." for the US release. Darlene Lacey, a producer on the Disney side of DuckTales would say of the partially unused line in a Kotaku interview:
"It seemed so earnest and dramatic, I was so tempted to leave it as is, but I knew I couldn’t. So, I changed it to the more polished, but forgettable ‘Right, lads! I couldn’t have done it without you. I really am the richest duck in the world.’ I love that fans found out about the original ending. It was the better line!"
During development of Pizza Tower, multiple demo builds were released - among these was a build known as the "Peter Griffin Experience", built off of the 2018 "early test build". This demo replaced every single sprite of Peppino with a highly compressed edit of a stock image of Peter Griffin from Family Guy made to resemble Peppino, and replaced one of the game's musical tracks with a fan-made Family Guy remix.
After this build, the Peter Griffin "arms resting" pose would appear in some builds as a taunt, albeit as an actual sprite and not an edit, and a video would be posted by developer McPig showcasing the taunt, accompanied by the first note of the Family Guy theme song, under the name "family", likely referencing a a meme video that plays the first note and ends. This taunt was removed for unknown reasons in the final game.
Bio Force Ape is a game that was never released - it did, before it's cancellation, get a spotlight in Nintendo Power, creating a level of curiosity surrounding it within NES fan communities. Capitalizing off of this curiosity, a post would be made on the Digital Press forum in 2005 claiming to show screenshots of a leaked prototype. While the first post appeared legitimate, the hoax would eventually be unraveled starting with a screenshot of a glitched super move that was "so powerful [that] it messes up the game's graphics", which humorously made it appear that Bio Force Ape was unleashing a powerful fart attack, as a set of glitched graphics appeared next to a crouching animation. The poster, going under the username PaulB812, would refuse to dump the game and refer to anybody who asked for it to be released as either "communists" or "butter-slathered... hoarding fatties", before finally unveiling the prank with a game screenshot of a cutscene where a fat butter monster points out that the ape is "worth 2K monies[sic]", before the ape punches him while saying "EAT COMMUNISM!" A real prototype would be leaked in 2010.
The reptilian puffs of smoke that emerge when Mario ground pounds inside a giant Goomba Shoe in the Super Mario Bros. 3 style of the Super Mario Maker series are updated sprites from an unreleased and highly experimental Super Nintendo prototype known as Super Donkey.
Unusually, the 3DS version of Donkey Kong: Original Edition was originally released with an unfinished ROM predating the hack's previous Wii release. The only change in the unfinished version was that the copyright assigned the game as a 2008 release instead of 2010, suggesting that it was originally intended to be released for the 25th anniversary of Donkey Kong's Famicom port and delayed for Super Mario Bros.' anniversary. The game would soon be patched the use the Wii ROM instead.
On the HUD of Awesome Possum Kicks Dr. Machino's Butt!, there is a portrait of Awesome that will go from happy to agitated as he takes more damage - in prototype versions of the game, this instead has Awesome's skin slowly chip off to reveal his skull. Additionally, after dying in the prototype, he will turn into a skeleton, and when his last life is lost the screen will cut to red instead of teal. The final game's Game Over screen, which shows unspecified tombstones covered in trash and rats, could be considered a leftover from this darker direction for the game.
Instead of a chicken who gets pushed backwards when run over, Freeway was originally going to feature a human protagonist who turns into a splatter of blood when killed. This version of the game is referred to by fans as Bloody Human Freeway.
Among the material uncovered in the 2020 Gigaleak, a large-scale data leak from Nintendo's internal servers, was a series of documents surrounding Project INDY, an early iteration of the Nintendo Switch co-developed with ST Microelectronics. Project INDY was envisioned as a successor to the Nintendo 3DS and was halfway between it and the Wii U in terms of processing power.
The system would've carried over many of the 3DS' features, including dual-screen functionality, touch controls, stereoscopic 3D, motion sensors, augmented reality functionality, and StreetPass support. The system also would've featured backwards compatibility with 3DS game cards, Bluetooth connectivity (including support for wireless speakers and headsets), GPS functionality, a videotelephony app, the ability to wirelessly project games to a TV screen via Miracast, and support to quickly convert a commercially released unit into a developer system, easing development costs for independent studios. Many of these features would be carried over to the Switch in modified forms.
Technical documents for Project INDY show that while prototype software was developed for the system, Nintendo were unsure about its specifications and came up with various alternative options, such as support for 120 fps video, an 800p display, and a design with a single, oblong touchscreen that spans the full face of the device save for two joysticks near each end. The latter design was the final iteration that Nintendo came up with before ceasing work with ST Microelectronics in late 2014. By this point, Nintendo had devised the Switch's final name, listing it on the design's blueprints.
An earlier iteration of this oblong design would also become the basis for a hoax image created in the interim between Nintendo president Satoru Iwata's announcement of the Switch's development in March 2015 and the company's first public reveal of the device in October 2016. The image is a 3D-printed mockup of the Switch based on a patent filed earlier in 2014, which itself reveals that Nintendo was still considering stereoscopic 3D, backwards compatibility with 3DS games, and videotelephony support.
The Zero Wing parody image in Invasion of the Yokel-Snatchers was originally going to be a Simpsonized version of CATS, rather than Kang and Kodos dressed as CATS.
A fully functional version of Windows 3.1's Reversi game exists within the source code for Windows XP. The original graphics still work, but for unknown reasons the game forces itself to be monochrome.
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The "Mine 2.6" prototype of the 1990 Windows Minesweeper has a custom cursor depicting a foot that, when a mine is unveiled, explodes and exposes a bone.
In the weeks prior to Nickelodeon All-Star Brawl 2's release, a near-complete prototype build of the game leaked online. The Twitter account for the game's main developer, Fair Play Labs, accidentally retweeted a GIF of SpongeBob dancing from an unrevealed sound test mode and promptly deleted it. Community manager Thaddeus Crews expressed that, while he didn't have a particular moral problem with fans playing the leaked build, he advised against competitive players using it for practice due to how outdated it is.
A prototype build for PlayStation All-Stars Battle Royale shows an early character select screen with a set of unused characters:
•Chop Chop Master Onion from the PaRappa the Rapper series •Captain Blasto from Blasto •Buzz from the Buzz! series •A Big Kulche from the LocoRoco series •Dr. Nefarious from the Ratchet & Clank series •A Eucadian Soldier from Warhawk •A knight from Fat Princess •Um Jammer Lammy from the PaRappa the Rapper series
Notably, Dr. Nefarious is featured in the roster without Ratchet or Clank. PaRappa the Rapper is the most represented series in this roster, and has more characters than any one series would get in the final game including DLC. The knight would appear in Fat Princess' moveset, LocoRoco and Buzz! would be represented through stages, and Blasto would be absent completely.
The game was originally intended to be the fifth installment of the Super Mario Bros. series, with two leaked prototypes from December 1994 featuring a title screen with the logo Super Mario Bros. 5: Yoshi's Island. Come the final release, and the prefix would be shortened to Super Mario. This explains why the international release was titled Super Mario World 2: Yoshi's Island, as the original Super Mario World was subtitled Super Mario Bros. 4 in Japan.
Additionally, the later of the two prototypes features a radically different design for the logo, using a much sleeker and blockier font. The final release would revert to the earlier logo, barring the aforementioned truncated prefix.
Inside the prototype Xbox version of Pac-Man World Rally, files pertaining to Snoopy from Peanuts and a vehicle for him can be found. While the initial discovery of these files left a lot of mystery over whether they were leftovers from another project or a scrapped crossover, a concept image from World Rally would emerge shortly after revealing Snoopy was indeed planned as a crossover racer.
Smart Bomb Interactive, the developers of Pac-Man World Rally, worked on the game Snoopy vs. the Red Baron around the same time, and a few shared files from that game including placeholder cutscene dialogue can also be found in Pac-Man World Rally's data.
A prototype for Twisted Metal: Small Brawl has an unused 9/11 memorial screen.
There exists an extremely early test prototype of Disney's Lilo & Stitch 2: Hänsterviel Havoc that is simply just a compilation of a platforming level from Ed, Edd n' Eddy: Jawbreakers and a racing level from Hot Wheels: World Race as a proof-of-concept that both styles of gameplay could fit in a single game pak. The only element of Lilo & Stitch that exists with in the game is Eddy's sprite in the Jawbreakers segment being replaced with Stitch.
In a prototype version of Mortal Kombat for Game Boy, the legal disclaimer screen had a placeholder that simply read "LEGAL SCREEN".
Nintendo planned to release the 64DD in North America and even manufactured test units with fully translated BIOSes and functional region locking. However, the idea was ultimately dropped due to the add-on's low sales in Japan. Concrete proof of these plans wouldn't become public until 2016, when YouTuber Jason Lindsey (a.k.a. MetalJesusRocks) found a surviving test unit and verified its legitimacy with former Nintendo of America employee Mark DeLoura.
In the Japanese version, and prototype US builds, of DuckTales, the ending line of the game was the grammatically incorrect, and arguably out-of-character, Scrooge line "There really is more important treasure than this, that is... dream and friends", which was changed to "I couldn't have done it without you. I really am the richest duck in the world." for the US release. Darlene Lacey, a producer on the Disney side of DuckTales would say of the partially unused line in a Kotaku interview:
During development of Pizza Tower, multiple demo builds were released - among these was a build known as the "Peter Griffin Experience", built off of the 2018 "early test build". This demo replaced every single sprite of Peppino with a highly compressed edit of a stock image of Peter Griffin from Family Guy made to resemble Peppino, and replaced one of the game's musical tracks with a fan-made Family Guy remix.
Bio Force Ape is a game that was never released - it did, before it's cancellation, get a spotlight in Nintendo Power, creating a level of curiosity surrounding it within NES fan communities. Capitalizing off of this curiosity, a post would be made on the Digital Press forum in 2005 claiming to show screenshots of a leaked prototype. While the first post appeared legitimate, the hoax would eventually be unraveled starting with a screenshot of a glitched super move that was "so powerful [that] it messes up the game's graphics", which humorously made it appear that Bio Force Ape was unleashing a powerful fart attack, as a set of glitched graphics appeared next to a crouching animation. The poster, going under the username PaulB812, would refuse to dump the game and refer to anybody who asked for it to be released as either "communists" or "butter-slathered... hoarding fatties", before finally unveiling the prank with a game screenshot of a cutscene where a fat butter monster points out that the ape is "worth 2K monies[sic]", before the ape punches him while saying "EAT COMMUNISM!" A real prototype would be leaked in 2010.
The reptilian puffs of smoke that emerge when Mario ground pounds inside a giant Goomba Shoe in the Super Mario Bros. 3 style of the Super Mario Maker series are updated sprites from an unreleased and highly experimental Super Nintendo prototype known as Super Donkey.
Unusually, the 3DS version of Donkey Kong: Original Edition was originally released with an unfinished ROM predating the hack's previous Wii release. The only change in the unfinished version was that the copyright assigned the game as a 2008 release instead of 2010, suggesting that it was originally intended to be released for the 25th anniversary of Donkey Kong's Famicom port and delayed for Super Mario Bros.' anniversary. The game would soon be patched the use the Wii ROM instead.
On the HUD of Awesome Possum Kicks Dr. Machino's Butt!, there is a portrait of Awesome that will go from happy to agitated as he takes more damage - in prototype versions of the game, this instead has Awesome's skin slowly chip off to reveal his skull. Additionally, after dying in the prototype, he will turn into a skeleton, and when his last life is lost the screen will cut to red instead of teal. The final game's Game Over screen, which shows unspecified tombstones covered in trash and rats, could be considered a leftover from this darker direction for the game.
Among the material uncovered in the 2020 Gigaleak, a large-scale data leak from Nintendo's internal servers, was a series of documents surrounding Project INDY, an early iteration of the Nintendo Switch co-developed with ST Microelectronics. Project INDY was envisioned as a successor to the Nintendo 3DS and was halfway between it and the Wii U in terms of processing power.
The Zero Wing parody image in Invasion of the Yokel-Snatchers was originally going to be a Simpsonized version of CATS, rather than Kang and Kodos dressed as CATS.
A fully functional version of Windows 3.1's Reversi game exists within the source code for Windows XP. The original graphics still work, but for unknown reasons the game forces itself to be monochrome.
In the weeks prior to Nickelodeon All-Star Brawl 2's release, a near-complete prototype build of the game leaked online. The Twitter account for the game's main developer, Fair Play Labs, accidentally retweeted a GIF of SpongeBob dancing from an unrevealed sound test mode and promptly deleted it. Community manager Thaddeus Crews expressed that, while he didn't have a particular moral problem with fans playing the leaked build, he advised against competitive players using it for practice due to how outdated it is.
A prototype build for PlayStation All-Stars Battle Royale shows an early character select screen with a set of unused characters:
The game was originally intended to be the fifth installment of the Super Mario Bros. series, with two leaked prototypes from December 1994 featuring a title screen with the logo Super Mario Bros. 5: Yoshi's Island. Come the final release, and the prefix would be shortened to Super Mario. This explains why the international release was titled Super Mario World 2: Yoshi's Island, as the original Super Mario World was subtitled Super Mario Bros. 4 in Japan.
Inside the prototype Xbox version of Pac-Man World Rally, files pertaining to Snoopy from Peanuts and a vehicle for him can be found. While the initial discovery of these files left a lot of mystery over whether they were leftovers from another project or a scrapped crossover, a concept image from World Rally would emerge shortly after revealing Snoopy was indeed planned as a crossover racer.