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MMOShooting
MMOShooting is an online gaming genre which feature a world and a large number of simultaneous players.These games provide large-scale, sometimes team-based combat. The addition of persistence in the game world means that these games add elements typically found in RPGs, such as experience points.[citation needed] However, MMOShooting games emphasize player skill more than player statistics, as no number of in-game bonuses will compensate for a player's inability to aim and strategize.

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MMORTS
Massively multiplayer online real-time strategy games, also known as "MMORTS", are games that combine real-time strategy (RTS) with a persistent world. Players often assume the role of a general, king or other type of figurehead, leading an army into battle, while maintaining the resources needed for such warfare. The titles are often based in a sci-fi or fantasy universe and distinguished from single or small-scale multiplayer RTSes by the number of players and common use of a persistent world, generally hosted by the game's publisher, which continues to evolve even when the player is not currently playing.

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MMORacing
MMOR means massively multiplayer online racing. Currently there are only a small number racing based MMOs, including Kart Rider, Upshift StrikeRacer, Test Drive Unlimited, Project Torque, Drift City and the upcoming Need for Speed: World Online. The Trackmania series is the worlds largest MMOG racing game and holds the world record for "Most Players in a Single Online Race". Although Darkwind: War on Wheels is more combat based than racing, it is also considered an MMOR.

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MMORhythm
Massively multiplayer online rhythm games (MMORGs), sometimes called massively multiplayer online dance games (MMODGs), are MMOGs that are also music video games. This idea was influenced by Dance Dance Revolution. Audition Online is another casual massively multiplayer online game and it is produced by T3 Entertainment.

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MMOSport
A massively multiplayer online sports game is a title where players can compete in some of the more traditional major league sports, such as Football (called soccer in some parts of the world), basketball, baseball, hockey, golf or American football. Titles that qualify as MMOSG have been around since the early part of the millennium but only recently have they started to receive the endorsements of some of the official major league associations and players.

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MMOScifi
Beginning in the 1970s, the earliest role-playing games (or "RPGs"), such as Dungeons & Dragons and Traveller, had science fiction and fantasy settings and speculative settings continue to form the basis for the majority of RPGs up to the present.
\r\nIn the 1980s, computer and video games adopted speculative settings and themes, either from original works or based on existing works. The virtual-reality nature of computer games, allowing game algorithms to simulate behavior impossible in reality lend themselves to science fiction characters and technological options within the game world.

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MMOHistoric
Traditional and live-action role-playing games in the historical genre. Most of these are actually alternate history games, adding fantasy or science fiction to strictly historical elements.

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MMOAdventure
An adventure MMOG is a game in which the player assumes the role of protagonist in an interactive story that is driven by exploration and puzzle-solving instead of physical challenges such as combat.