Massively multiplayer online role-playing game

Massively multiplayer online role-playing game (MMORPG) is a genre of computer role-playing games in which a very large number of players interact with one another within a virtual game world.

As in all RPGs, players assume the role of a character (often in a fantasy world) and take control over many of that character's actions. MMORPGs are distinguished from single-player or small multi-player RPGs by the number of players, and by the game's persistent world, usually hosted by the game's publisher, which continues to exist and evolve while the player is away from the game. This is often referred to as being offline.

MMORPGs are played throughout the world. Worldwide revenues for MMORPGs exceeded half a billion dollars in 2005, and Western revenues exceeded US$1 billion in 2006. In 2008, Western consumer spending on subscription MMOGs grew to $1.4 billion. World of Warcraft, a popular MMORPG, had over 12 million subscribers as of October, 2010.


In nearly all MMORPGs, the development of the player's character is a primary goal. Many MMORPGs feature a character progression system in which players earn experience points for their actions and use those points to reach character "levels", which makes them better at whatever they do. Traditionally, combat with monsters and completing quests for NPCs, either alone or in groups, are the primary ways to earn experience points. The accumulation of wealth (including combat-useful items) is also a way to progress in many MMORPGs, and again, this is traditionally best accomplished via combat. The cycle produced by these conditions, combat leading to new items allowing for more combat with no change in gameplay, is sometimes pejoratively referred to as the level treadmill, or 'grinding'. The role-playing game Progress Quest was created as a parody of this trend.

Also, traditional in the genre is the eventual demand on players to team up with others in order to progress at the optimal rate. This sometimes forces players to change their real-world schedules in order to "keep up" within the game-world.