Mortal Kombat (commonly abbreviated "MK") is an American video game franchise series created by Ed Boon and John Tobias. The first four renditions and their updates were developed by Midway Games and initially released on arcade machines, and later to home consoles. The arcade titles were later picked up by Acclaim Entertainment for the home console conversions. Beginning with Mortal Kombat: Deadly Alliance, Midway Games exclusively created home versions of Mortal Kombat up until Mortal Kombat vs. DC Universe. Following Midway's bankruptcy, the franchise was picked up by Warner Bros. in July 2009 and became a part of the Warner Bros. Interactive Entertainment. The development of the first game was originally based on an idea of making a video game (according to Ed Boon, the game was originally meant to be a fast experiment) starring Jean-Claude Van Damme, but that idea fell through and Mortal Kombat was created instead and released in 1992. The original game has spawned many sequels and has been spun off into several action-adventure games, films (animated and live-action with its own sequel), and television series (animated and live-action). Other spin-offs include various comic book series, a card game and a live-action tour. Along with Capcom's Street Fighter, Mortal Kombat has become one of the most successful and influential fighting franchises in the history of video games. The series is known for its high levels of bloody violence, including, most notably, its Fatalities—finishing moves, requiring a sequence of buttons to perform, which, in part, led to the creation of the ESRB. The series name itself is also known for using the letter "K" in place of "C" for the hard C sound, thus intentionally misspelling the word "combat", as well as other words with the hard C sound within later games in the series. Early games in the series were especially noted for its realistic digitized sprites (which differentiated it from its contemporaries' hand-drawn sprites), as well as an extensive use of palette swapping to create new characters.

Mortal Kombat II (commonly abbreviated as MKII) is a competitive fighting game originally produced by Midway Games for the arcades in 1993. It was later ported to multiple home systems, including the PC, Amiga, Game Boy, Sega Game Gear, Sega Genesis, Sega Saturn, Super Nintendo Entertainment System, and various PlayStation consoles.Mortal Kombat II was the second game in the Mortal Kombat series, improving the gameplay and expanding the mythos of the original Mortal Kombat, notably introducing more varied Fatality finishing moves and several iconic characters, such as Kitana, Kung Lao, Mileena and the series' recurring villain Shao Kahn. The game's plot continues from the first game, featuring the next Mortal Kombat tournament set in the otherdimensional realm of Outworld, with the Outworld and Earthrealm representatives fighting each other on their way to the evil emperor Shao Kahn.The game was an unprecedented commercial success and was acclaimed by most critics, receiving many annual awards and having been featured in various top lists in the years and decades to come, but also perpetuating a major video game controversy due to the continuously over-the-top violent content of the series. Its legacy includes spawning a spin-off game Mortal Kombat: Shaolin Monks and having the greatest influence on the 2011 reboot game Mortal Kombat, as well as inspiring numerous video game clones.

Mortal Kombat II Unlimited is a full scale hack of the Sega Genesis Mortal Kombat II game, Originally work on the hack ceased with version 07, but in 2011 version 1.0 was released which added many new graphical features. Added a combo system;Secret fighters now fully playable;Bosses now fully playable;More new sounds;New Select Screen and Main Menu;New stages and music from Mortal Kombat 1;New moves such as Brutality;New Game Modes such as Practice and Endurance;Returned biographies/Endings/Intro/VS-screens from the arcade version;and many more…

Mr. Needlemouse is a hack of the original Sonic the Hedgehog game for the Sega Mega Drive / Genesis, by MKAmeX. It replaces Sonic the Hedgehog with one version (arguably the strangest) of his designer Naoto Ohshima's early prototype of the character, Mr. Needlemouse. Planned features include a complete overhaul of the game's graphics to resemble early concept art, and perhaps new music.

Mr. Nutz is a side scrolling, 2D platformer video game published by Ocean Software. It was first released for the Super Nintendo Entertainment System in 1993[citation needed], then later released for the Mega Drive and Game Boy in 1994[citation needed], then Sega Channel in 1995, followed by Game Boy Color in 1999, and Game Boy Advance remake in 2001. The player controls the one player character, Mr. Nutz an Anthropomorphic red squirrel wearing shoes, gloves and a cap through six themed levels. The end goal is to stop Mr. Blizzard, a yeti, who is the final boss and is trying to take over the world by using his magic powers to turn it into a mass of ice. The game shares similarities with other platformers of the same time, being that jumping is the main technique used in the game to navigate both fixed and moving platforms and defeat or avoid most enemies. Ammunition, in the form of nuts, can be collected and thrown at enemies. Ocean released in 1994 another game on the Amiga under the name Mr. Nutz: Hoppin' Mad. Developed by Neon Studios, it featured the same titular character but with different, faster and more wide-open gameplay, unrelated levels and enemies, another story, and a large overworld map instead of a linear path to follow in a mini-map. This game was also going to be released for the Sega Mega Drive in 1995 as Mr Nutz 2, but it got shelved. A playable build exist, leaked in the form of source code and compiled upon.