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Unlicensed developers and fans have created unofficial ''Mario'' media, especially video games, relating to the ''Mario'' franchise. These products include video games, ROM hacks, and animations. Due to the popularity of the franchise, some of these unlicensed products have received critical attention.

In September 2016, Nintendo issued over 500 DMCA takedown requests on diverse websites for various fan games based on Nintendo intellectual properties, resulting in the end of many infringing games' development.

Video games

Console games

Several unofficial Mario games have been released for video game consoles, including unlicensed games, ROM hacks, and game mods.

* ''Super Mario World'', an unlicensed Nintendo NES/Famicom demake of ''Super Mario World'', developed by Hummer Team and published by J.Y. Company (both defunct Taiwanese companies based in Taipei) in 1995.
* ''Kaizo Mario World'', also known as ''Asshole Mario'', is a series of three ROM hacks of the 1990 Super Nintendo Entertainment System video game ''Super Mario World'', notable for deliberately breaking normal rules of "accepted" level design and featuring extreme difficulty. It became the namesake for Kaizo, a genre of Mario games modified for intense difficulty.
* '' Super Dram World'' is series of two ''Super Mario World'' ROM hacks created by PangaeaPanga and named after speedrunner Dram55, designed for high difficulty.
*''Super Panga World'' is a ROM hack of ''Super Mario World'' created by Linkdeadx2 and dedicated to PangaeaPanga.
* ' (), released in English as ''Big TV Mary Bar'' and also known as ''Mario Lottery'', ''TV Mario'', is an unlicensed video game for the Family Computer made by Bit Corporation and released by Fiver Firm (五合企業有限公司), under their first name "Namco Corporation". It is based on the Taiwanese slot machine game ''Xiǎo Mǎ Lì'', where features a character resembling Mario with an F on his cap, which has become known as "Fortran" based on hidden text discovered in the ROM. The game is a roulette wheel/slot machine – different buttons control the betting, and each button produces a musical note. Landing on the coin produces a message in Chinglish: "PUSH START TO RICH". It became an internet meme when users created fad videos on YouTube.
*'' 7 Grand Dad'', also known as ''Primitive Mario VII'', is a bootleg ROM hack of '' The Flintstones: Rescue of Dino and Hoppy'' in which Fred Flintstone's head is replaced with that of Mario. The bootleg is notorious for its nonsensical title, as well as its lack of effort in removing ''Flintstones'' elements such as the characters and theme song. The game has become an internet meme due to Twitch streamer Joel "Vargskelethor" Johannson's shocked reaction to it and YouTuber SiIvaGunner's remixes of the game's soundtrack.
*'' Kart Fighter'' is a 2D fighting game produced for the Nintendo Entertainment System. The game features unauthorized appearances by Nintendo's mascot Mario and the rest of the cast of '' Super Mario Kart'' in a port of ''Street Fighter II''.
*''Somari'' is a port of Sega's flagship video game '' Sonic the Hedgehog'', produced for the Nintendo Entertainment System and sold primarily in Asia, Russia, and other regions where pirate Famicom cartridges were distributed, in 1994. The game features a character named "Somari" – Mario wearing Tails' shoes.
*''Super Mario Bros. 2'' is a pirated port of ''Super Mario Bros''. for the Mega Drive, made by Gametec in 1998. The game uses sprites from ''Super Mario All-Stars'' and uses the engine of another pirated game from another console, called "Chip & Dale", and it's about thowing boxes to the enemies.
*''Project M'' is a modification of the 2008 fighting game ''Super Smash Bros. Brawl'' for the Wii, created by the community to retool ''Brawl'' to play more like its two predecessors, '' Super Smash Bros.'' and '' Super Smash Bros. Melee''.
*''Newer Super Mario Bros. Wii'' is a modification of '' New Super Mario Bros. Wii'', which adds new, custom elements to the original game. It later received a follow-up on the Nintendo DS, a modification of ''New Super Mario Bros.'', ''Newer Super Mario Bros. DS'', and a follow-up mod for ''New Super Mario Bros. U'' called ''Newer Super Mario Bros. U'' was started but later cancelled. There is an updated version of ''Newer Super Mario Bros. Wii'' in the works, titled ''Newer Super Mario Bros. Wii Plus''.
*''Kaizo Mario 64'' is a ROM hack of ''Super Mario 64'' where each level is redesigned to be extremely difficult.
* Modder Kaze Emanuar has produced multiple ROM hacks of ''Super Mario 64'':
**', converting the game into a 2.5D running game in the spirit of ''Super Mario Run'';
**', enabling online multiplayer;
**', a ''Mario Maker''-like level editor;
**', featuring levels based on ''Super Mario Odyssey'' while also adding its mechanic of possessing enemies by throwing Mario's hat;
**', featuring all levels from ''Donkey Kong 64'';
**', an original game with new levels made using ''Super Mario 64''s engine;
**', in which '' The Legend of Zelda: Ocarina of Time'' world is recreated in ''Super Mario 64''s engine, with new gameplay elements, puzzles and story;
**', a battle royale-style mod set on a huge map made up of all ''Super Mario 64'' levels, in the style of ''Fortnite Battle Royale'' and ''PlayerUnknown's Battlegrounds''.
*' is a ROM hack of the 1999 Nintendo 64 fighting game '' Super Smash Bros.'' It retains the gameplay style of the original release while adding new gameplay modes, stages, and characters; these include characters from later ''Super Smash Bros.'' games such as Ganondorf Bowser, and Sonic the Hedgehog, and new characters such as Conker the Squirrel and the Mad Piano from ''Super Mario 64''.

Level editors

There exist several unofficial level editors created to allow gamers without programming skills to easily make their own ROM hacks or levels in Mario games.
*Super Mario Bros. X is a fangame blending elements from ''Super Mario Bros'', ''2'', ''3'' and ''World'', and includes both a level editor, as well simultaneous split-screen multiplayer.
*Lunar Magic is a level editor for ''Super Mario World''.
*NSMB Editor is a level editor for ''New Super Mario Bros.''
*Reggie! Level Editor is a level editor for '' New Super Mario Bros. Wii''.
*Miyamoto! Level Editor is a level editor for ''New Super Mario Bros. U and New Super Luigi U'', similar to Reggie!.
*CoinKiller is a level editor for ''New Super Mario Bros. 2''.
*Super Mario ReMaker is a Windows-based level editor designed to replicate the Wii U title ''Super Mario Maker'' on computers.
*Toad's Tool 64 is a level editor for ''Super Mario 64'' developed by Qubed Studios.

Computer games

Unofficial Mario games playable on computers include mostly browser-based games, game parodies, and fangames sometimes inserting the character or world of Mario in the engine or style of other projects.
*Mario Kart PC'', is a browser game that is well, you guessed it, Mario Kart on PC, and also mobile, known (not really) for being a 2D Mario Kart game.
* '' Syobon Action'', also referred to as ''Cat Mario'', a Mario parody known for its difficulty and troll levels.
* ''Ennuigi'' is a browser game designed by Josh Millard that centers on Luigi's inability to come to terms with the lack of narrative in ''Super Mario Bros.''
* ' is a Flash game based on ''Super Mario World'', featuring former United States president Barack Obama as the protagonist against enemies such as lobbyists, Sarah Palin, and pigs wearing lipstick.
* ' is a sidescrolling platformer mashup of ''Super Mario Bros.'' and ''Tetris''. As the visible screen automatically scrolls to the right, the player moves to the right while avoiding obstacles. The player can switch between moving the player-character Mario and dropping tetrominos that Mario can use as platforms. The game has traditional ''Mario'' enemies. The Flash game is freely available via Newgrounds. Chris Donlan of ''Edge'' wrote that the game showed signs of hasty development. Its gameplay was occasionally inelegant as a result. Jenni Lada of ''TechnologyTell'' particularly appreciated how she could build a staircase to the flagpole at the end of the level.
* '' Super Mario War'' is fan-made battle-based ''Mario'' platformer. The game has been ported to a number of platforms, including an unofficial port to the Nintendo Wii.
* ', a 2019 browser game in which dozens of players simultaneously attempt to outrun each other in battle royale-style gameplay. After receiving a takedown notice, he edited the game to use non-Nintendo assets as ''DMCA Royale''. Later on, after a second takedown, it was (and is currently) owned by GoNow, who added vertical scrolling, more block choices and conveyer belts. The game is currently called MRoyale.
* ''Mari0'' is a fan game that combines elements of ''Portal'' and ''Super Mario Bros.''
* ''Super Mario Bros. Crossover'' is a flash game that puts various video game characters into ''Super Mario Bros.'' levels.
* ''Super Smash Bros. Crusade'' is a '' Super Smash Bros.'' fan game featuring over 60 characters and 24 stages.
* ''Super Smash Flash'' is a series of non-profit, fighting, crossover, fan-made Flash games based on the ''Super Smash Bros.'' series.
* ''Secret Maryo Chronicles'' is a free, open source two-dimensional platform game.
* '' Super Smash Land'' is a demake of '' Super Smash Bros.'' featuring six playable characters and eleven stages. The game visual design resembles the graphics from the Nintendo Game Boy.
* ''No Mario's Sky'' is an indie game that crosses over between the gameplay of ''No Man's Sky'' and ''Super Mario Bros.'' Due to a Digital Millennium Copyright Act notice filed by Nintendo, the game was re-released as '' DMCA's Sky'' with all in-game references to ''Super Mario Bros.'' removed.
* '' Mario Kart: Source'' was a planned total conversion mod in development using the Source game engine developed by Valve. It was first announced in 2006 with development suspending in November 2012 due to difficulties in making a fun racing game with the engine. It is based on the ''Mario Kart'' series.
* ''Kill the Plumber'' is a platform game parody of ''Super Mario Bros.'' Players control the inhabitants of a kingdom invaded by a plumber and must stop him before he can reach a princess.
* '' Trumptendo'' is a website created by artist Jeff Hong, featuring hacked versions of various Nintendo Entertainment System games (including ''Super Mario Bros.'') that replace characters with Donald Trump and other United States political figures.
*'' Super Mario 64 HD'' is an unofficial