Controversy of Mortal Kombat
In particular, the series is often criticised for its excessive use of graphic and bloody violence (in both the regular combat and the Fatalities, finishing moves which allow the player to kill, dismember or otherwise maim their opponents), which remains a popular draw of the series. The violent nature of the series, one of the earliest of its kind, has led to the creation and continued presence of the ESRB and others ratings boards for video games.
Violence controversies 
In the early 1990s, the "Fatality", a lethal finishing move featured in the Mortal Kombat series, was a source in a major video game controversy and a moral panic, resulting in a U.S. Congressional hearing and helping to pave a way for the Entertainment Software Rating Board (ESRB) game rating system in 1994. Mortal Kombat was the first game to receive a mature ESRB rating. In 2010, Boon revealed that he actually sympathised with much of the outrage and admitted, "I wouldn't want my ten-year-old kid playing a game like that." In 2011, CNN ranked this as the second biggest video game related controversy, adding that "the gore also helped it to become one of the most popular video games of all time." In 2012, Time commented that "the reason the 1992 classic remains seminal is because it broke an implicit taboo about what was okay to put in a game. And Western civilization is still standing."
As in the case of the first Mortal Kombat game, the absurdly bloody content of Mortal Kombat II became the subject of a great deal of controversy regarding violent video games. In September 1994, Mortal Kombat II was put in the index of the works allegedly harmful to young people by the German Federal Department for Media Harmful to Young Persons (Bundesprüfstelle für jugendgefährdende Medien, or BPjM). In February 1995, all versions of the game except for Game Boy were confiscated from the German market for violating §131 of Germany's penal code, that is for showing gruesome violence against humans (the ban ended in February 2005, due to the 10-year limitation for confiscations). In 2012, Boon said: "I've always had the position that the rating system was a good idea and should be put in place. Once Mortal Kombat II came out, there was a rating system in place. We were an M-rated game, and everybody knew the content that was in there, so it became almost a non-issue."
The 2011 Mortal Kombat reboot game was banned in Australia, Germany and South Korea. The Australian Minister for Home Affairs Brendan O'Connor has asked to be briefed on the Mortal Kombat decision, citing "public disquiet on the issue". Previously, the original MK game, along with Time Killers and Night Trap, and its media coverage (such as the 1993 The Courier-Mail article titled "Child Ban On Violent Video Games Urged") contributed to the Australian Senate setting up an inquiry that led to the Commonwealth Classification Act, which came into force on March 1, 1995. The Act introduced the Australian Classification Board almost exactly 18 years before the 2011's Mortal Kombat game was finally banned by the Board for its "explicit depictions of dismemberment, decapitation, disembowelment and other brutal forms of slaughter." In February 2013, after the introduction of the adults only rating, Mortal Kombat was unbanned in Australia and re-rated R18+ uncensored.
Mortal Kombat's advertisements have also received some criticism. In the 1993 hearings on violent video games, U.S. Senator Joseph Lieberman criticized Sega for one of its TV commercials saying that it promoted violence. The video, as described by Weekly Reader, "shows a boy gaining the respect of his friends after winning Mortal Kombat. At the end of the commercial, the boy angrily knocks over a tray of cookies given to him by friends now frightened by the boy's fighting ability. The boy roars, 'I said I wanted chocolate chip!'"
In 2006, "Blood on the Carpet", a TV commercial for Mortal Kombat: Shaolin Monks created by London-based Maverick Media, was "slammed by the Advertising Standards Authority as condoning and glorifying violence." The video, as described by The Register, "features a boardroom scene in which a Mr Linn, the mysterious trouble-shooter at a sales meeting, instructs two men to fight. Punches lead to a pen being stabbed into an arm; then a water jug is smashed over an executive's head – before his heart is ripped from his chest. Mr Linn concludes proceedings by decapitating another executive with his hat." The result of the complaint was, as quoted from the ASA report: "We told Midway not to repeat the approach and told them to consult CAP Copy Advice before producing future ads."
Some people attributed the series' supposed influence to cases of real-life violence. In 2008, Mortal Kombat was blamed for the so-called "Mortal Kombat murder" in which 17-year-old Lamar Roberts and 16-year-old Heather Trujillo were accused of fatally beating Trujillo's preteen half-sister, Zoe Garcia. Prosecutor Robert Miller alleged: "Zoe Garcia was the object of abuse by both Heather Trujillo and Lamar Roberts caused these injuries with Mortal Kombat [sic]."
In 2011, a study conducted by Dr. Brock Bastian from University of Queensland's School of Psychology and published in the Journal of Experimental Social Psychology "found evidence that playing violent video games leads players to see themselves, and their opponents, as lacking in core human qualities such as warmth, open-mindedness, and intelligence." Study participants were playing Mortal Kombat. Dr Bastian "said he believes the findings of this study point to the potential long-term effects of violent video game play and suggest that repeated exposure to these dehumanising experiences may result in chronic changes in self-perception."
In 2012, Wayne LaPierre, executive vice-president of the National Rifle Association (NRA), blamed violent video games, including Mortal Kombat, as a contributing factor in a rise of shooting rampage mass murders in the United States in wake of Sandy Hook Elementary School massacre. LaPierre claimed: "Guns don’t kill people. Video games, the media and Obama’s budget kill people. (...) And here's another dirty little truth that the media try their best to conceal: There exists in this country a callous, corrupt and corrupting shadow industry that sells, and sows, violence against its own people. Through vicious, violent video games with names like Bulletstorm, Grand Theft Auto, Mortal Kombat and Splatterhouse."
Court cases 
In 1996, Daniel Pesina (Johnny Cage, Sub-Zero, Scorpion, Reptile, Smoke and Noob Saibot) sued Midway Games, Williams Electronics Games, Inc, Acclaim Entertainment, Nintendo and Sega, alleging "that all defendants used his persona, name, and likeness without authorization in the home version of Mortal Kombat and Mortal Kombat II and the related products." The conclusion of Daniel Pesina v. Midway Manufacturing Co. was that "alleged use of martial artist's name, likeness or persona in a martial arts video game did not violate his common-law right of publicity."
In 1997, Philip Ahn (Shang Tsung), Elizabeth Malecki (Sonya), and Katalin Zamiar (Kitana, Mileena, Jade) jointly sued Midway Games, Williams Electronics Games, Acclaim, Nintendo and Sega for using their likenesses in an unauthorized way, seeking "a constructive trust on all monies defendants received and continued to receive from their alleged breach of their duties to [the] plaintiffs." Ahn, Zamiar, and Malecki alleged "that they were only modeling for the coin-operated video game, not the subsequent home video, home computer, and hand-held versions of the game." The conclusion of Philip Ahn v. Midway Manufacturing, et al. was "The plaintiffs lost on all counts because they had all consented to the videotaping and because the choreography and choice of movements used in the game were not jointly 'authored' by the individuals."
In 1997, 13-year-old Noah Wilson died when his friend Yancy stabbed him in the chest with a kitchen knife. The mother of Noah, Andrea Wilson, alleged that her son was stabbed to death because of Yancy's obsession with Mortal Kombat. Wilson said that the child was so obsessed with the game, that he thought he was actually the Mortal Kombat character Cyrax who, according to her claims, uses a finishing move in which he grabs the opponent in a headlock and stabs his opponent in the chest. However, despite the character's other varieties of finishing moves, the character Cyrax does not actually perform such a move at all. According to the court case report, the conclusion of Wilson v. Midway games, Inc. was that "Wilson's complaint fails to state a claim upon which relief can be granted."
In 2009, Lawrence Kasanoff, producer of Mortal Kombat films, TV series, soundtracks and the live tour, and his company Threshold Entertainment sued Midway in United States bankruptcy court over what he claimed are his intellectual property (IP) interests in the franchise in order to preserve his IP rights including copyrights to certain MK characters and to retain the right to create derivative film and television projects based on the franchise. Kasanoff attempted to block $33-million bid for MK assets by Warner Bros. company. The complaint claimed: "The Mortal Kombat series, as it stands today, is far more a creation of Threshold and Kasanoff than of Midway. Midway's creative input was almost entirely limited to the videogames. On their own, the videogames provided only minimal back-story and mythology, and only flat, 'stock' characters. (...) Kasanoff and Threshold were responsible for virtually all of the creative input that went into turning the videogame concept into a multimedia enterprise." As of 2011, the case was still pending.
In 1994, Guy Aoki, president of Media Action Network for Asian Americans, criticized Mortal Kombat II for allegedly perpetuating existing stereotypes of Asians as martial arts experts with the game's portrayal of the characters Kitana, Kung Lao, Liu Kang, Mileena, Raiden, Scorpion, Shang Tsung and Sub-Zero. Allyne Mills, publicist at Acclaim, answered this by saying: "This is a fantasy game, with all different characters. This is a martial arts game which comes from Asia. [sic] The game was not created to foster stereotypes."
In 2006, anti-video-game activist Jack Thompson ordered a cease and desist to Midway stating: "It has today come to my attention that the newly recently [sic] Mortal Kombat: Armageddon contains an unauthorized commercial exploitation of my name, photograph, image, and likeness within the game." In fact, what Thompson thought was an actual character put by the developer into the game, was actually just created by a player who used the game's "Kreate-a-Fighter" mode to construct a likeness of Thompson and demonstrated it in a film on YouTube. Thompson had then the video successfully removed.
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