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Explosive Fighter Patton from 1988 is believed to be the first video game to use the swear word "fuck", referring to the Famicom Disk System as the "fucking box". It is not known if this is an in-joke or a translation error.
This is followed by Skweek for Amstrad CPC in 1989, whose development builds leaked to the UK market, featuring a variety of vulgar in-joke placeholder phrases. The swearing version of the game has not known to be preserved, but it is alleged that one of these quotes was "fuck your mother!". This would make it the first use of "fuck" to be known for a fact to have been intentional, even if its distribution wasn't.
1990's Paranoia, the Japanese version of Psychosis features an 8-bit sound effect upon stage clear that appears to be made to evoke the phrase "fuck you!", which is played in accompaniment with an alien flipping the bird. This is technically the first vocalized use of "fuck", but is not a recording of a human voice, and is the first for-a-fact intentionally included use of "fuck".
1991's Llamatron contained a voice sample of the word "oh, fuck!" which was cut off. A glitch made it so that if you paused the game upon dying, it would play uncensored, making it the first clear vocalised use of "fuck", even if still not intentionally added.
1995's The Orion Conspiracy contains one of the earliest known uses of "fuck" that was clearly spoken, uncensored, and known for a fact to not be an oversight. Also of note is Discworld, released in the same year, having an Easter egg referencing John Cleese's 1989 eulogy to the late Monty Python member Graham Chapman. While both games released in the same year, it is unknown which game came out first as Discworld is the only one of the two to have a known release date, coming out on March 17, 1995.
Star Fox 64's development began with a series of experiments by character designer Takaya Imamura and programmer Kazuaki Morita. As Morita was new to 3D programming, creating something entirely new was difficult, and to make matters worse, they didn't have the final N64 hardware itself to work with, instead having to utilize a bulky dev computer and a modified SNES controller. The pair decided to begin development by porting the original Star Fox, which they thought would be better for easing into 3D. As this was Morita's first attempt at learning 3D, he began with inputting his own data and placing objects like cubes on a course, and then launched basic-looking Arwings. This prototype was affectionately named "Star Box".
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.
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.
Argonaut Software's Starglider games released in the 1980s, which were first-person combat flight simulators rendered with wireframe vector graphics, inspired them to come up with a prototype that would eventually lead to the creation of the first Star Fox. They created a prototype for the Nintendo Entertainment System codenamed as "NESGlider" that was based on the original game, utilizing a similar method to accelerate graphics to how the Super FX chip for the Super Nintendo Entertainment System later would. When they showed this prototype to Nintendo in 1990, they were instead advised to port and develop the game for the then-upcoming SNES. After Argonauts did that, Nintendo declared that this was the best 3D graphics the console could produce and that they hadn't designed the SNES with 3D games in mind. Argonaut staff suggested that if they wanted better, then they should let them design a 3D chip for them, and thus the Super FX chip was born.
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When Software Creations' SNES Batman pitch first leaked, its ROM header was modified to read "Real Shitty Batman!"
While Super Donkey is thought to have ultimately evolved into Super Mario World 2: Yoshi's Island, the project was likely tossed around as a Mario or Zelda game at various points in development.
Various development assets associated with Super Donkey, which were uncovered alongside the prototype in the 2020 Gigaleak, include sprites and animations for Link, Mario, and Donkey Kong; the animation files for Link are dated to fall 1990, while Mario's animation files are dated to winter of that year. Additional files for all three characters span overlapping periods in 1991. Link's sprites and animations indicate that Super Donkey was at one point planned to be a side-scrolling Zelda title similar to Zelda II: The Adventure of Link, while Mario's animations imply that the iteration that starred him and Donkey Kong eventually morphed into the 1994 Game Boy title Donkey Kong.
There were two evaluations held in which children less than 12 years old played a prototype version of the game. Based on the results, children who enjoyed playing the game were more likely to gain an interest in acquiring information on tobacco and its effects on people.
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.
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.
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.
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.
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.
"Reverence" was one of the last announced projects by Cyberdreams, but never made it past the Alpha phase before the company's closure. The game saw the player being chosen by the gods themselves to help determine the future of the human race, whom the gods believed to have grown too apathetic and unjust to live. It was intended to be a first-person shooter game, with the player wielding a variety of guns and spells as they traveled through four different realms to decide the fate of humanity. Each realm was modelled after a real life mythological god, those being Osiris (Egyptian god of the underworld), Kokyangwuti (Hopi goddess of life), Freyja (Norse goddess of love), and Manjursi (Tibetan god of wisdom). While the game itself was cancelled, a playable prototype was leaked in 2015.
In August 2015, location tests for DanceDanceRevolution (2014) were held in North America. This marked both the first time the series was location tested in North America since Dance Dance Revolution X2 and the first time eAMUSEMENT was officially supported in the region. The English translation was a more completed version of the one present in the Korean version. Furthermore, 47 songs were removed from this version due to copyright restrictions, mostly being licensed songs from previous entries and all the "U.M.UXBEMANI" songs.
In the end, DanceDanceRevolution (2014) was not released in North America, with the following game Dance Dance Revolution A becoming the first Arcade release in North America since Dance Dance Revolution X2.
A prototype for Barkley: Shut Up & Jam 2 shows that, instead of the photo used in the final game, the title screen was going to show a cartoon illustration of Charles Barkley.
During the 2006 Game Developers Conference (GDC) where Sony Computer Entertainment showcased a new demo for Resistance, the game previously known as "I-8". The demo showed the game in a much more complete form than the simple FPS that was shown at E3 2005. The gameplay was shown with new weapons very much like the Ratchet & Clank series, only now with a more realistic slant. The demo also showed off effects such as smoke trails on grenades, tactical troop movements, and enemies that came from the ceilings as the lead character ran down a devastated corridor.
A prototype for Color a Dinosaur shows that the game was originally called Paint Me! and used black backgrounds instead of white. Despite the title not signifying that the game features dinosaurs, there is nothing to suggest that the game was ever going to feature any pages other than dinosaurs, as all the pages on the prototype are also dinosaurs.
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.
A prototype build for PlayStation All-Stars Battle Royale shows an early character select screen with a set of unused characters:
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.
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.
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.
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.
A prototype for Barkley: Shut Up & Jam 2 shows that, instead of the photo used in the final game, the title screen was going to show a cartoon illustration of Charles Barkley.
A prototype for Color a Dinosaur shows that the game was originally called Paint Me! and used black backgrounds instead of white. Despite the title not signifying that the game features dinosaurs, there is nothing to suggest that the game was ever going to feature any pages other than dinosaurs, as all the pages on the prototype are also dinosaurs.