A Massively multiplayer online role-playing game (MMORPG) is a genre of computer role-playing games (CRPGs) in which a large number of players interact with one another in a virtual world. The term MMORPG was coined by Richard Garriott, the creator of Ultima Online, the game credited with popularizing the genre in 1997. As in all RPGs, players assume the role of a fictional 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 CRPGs 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. MMORPGs are very popular throughout the world. Worldwide revenues for MMORPGs exceeded half a billion dollars in 2005, and Western revenues exceeded US$1 billion in 2006. Cheats Cheating (video games) Cheating in computer games may involve cheat codes implemented by the game developers, modification of game code by third parties,[14][15] or players exploiting a software glitch. Modifications are facilitated by either cheat cartridge hardware or a software trainer.[14] Cheats usually make the game easier by providing an unlimited amount of some resource; for example lives, health, and/or ammunition.[13][14] Other cheats might provide an unusual or amusing feature, like altered game colors or graphical appearances. Glitches Software errors not detected by software testers during development can find their way into released versions of computer and video games. This may happen because the glitch only occurs under unusual circumstances in the game, was deemed too minor to correct, or because the game development was hurried to meet a publication deadline. Glitches can range from minor graphical errors to serious bugs that can delete saved data or cause the game to malfunction. Glitches in games for home computers, and now in consoles like the Xbox 360,Wii and PlayStation 3, may be later corrected if the developers release a patch.