The Corrupted Blood plague so closely resembled the outbreak of real-world epidemics that scientists are currently looking at the ways MMORPGs or other massively distributed systems can model human behavior during outbreaks. The reaction of players to the plague closely resembled previously hard-to-model aspects of human behavior that may allow researchers to more accurately predict how diseases and outbreaks spread amongst a population.[149]
Patch 1.9.3 added native support for Intel-powered Macs, making World of Warcraft a universal application. As a result of this, the minimum supported Mac OS X version has been changed to 10.3.9; World of Warcraft version 1.9.3 and later will not launch on older versions of Mac OS X.[61] PowerPC architecture Macs are no longer supported since version 4.0.1.[62]
The appearance of the game world was praised by critics. Most popular was the fact that a player could run from one end of the continent to the other without having to pause at a "loading screen" while part of the game is retrieved from storage.[86] The environment was described as "breathtaking". Players found it difficult to become lost, and each area in the game world had a distinct look that blended from one to the next.[21] Critics described the environment as "a careful blend of cartoon, fantasy art, and realism".[81] The game was found to run smoothly on a range of computer systems,[10] although some described it as basic,[21] and mentioned that the bloom light rendering effect can blur things.[20] One reviewer described the ability to fly over long stretches of scenery as "very atmospheric".[83] The user interface was liked, being described as "simple", with tooltips helping to get the player started.[10]

World of Warcraft fue anunciado por primera vez por Blizzard en el European Computer Trade Show en septiembre de 2001.25​ El desarrollo llevó unos 4 o 5 años e incluyó un extenso periodo de pruebas. Los gráficos 3D usaban elementos del motor de juegos de Warcraft III: Reign of Chaos.25​ El juego fue diseñado como un ambiente abierto donde los jugadores pudieran hacer lo que quisieran.26​
Tras los eventos narrados en Wrath of the Lich King, Arthas ha muerto, y la guerra en Rasganorte parece haber terminado, ya que la Plaga está controlada por Bolvar Fordragon, convertido en el nuevo Rey Exánime, el carcelero de los malditos. Pero entonces, misteriosos terremotos comienzan a sacudir toda la faz de Azeroth, y poco después, comienzan una serie de ataques elementales contra las capitales de la Alianza y la Horda. Estos ataques son el preludio del resurgimiento del Dragón Aspecto corrupto Alamuerte, que las destruirá, extendiendo su dañino poder por los dos continentes. Cinco años después, en los que se suceden los eventos narrados en la novela World of Warcraft: The Shattering, Ventormenta y Orgrimmar están en proceso de reconstrucción, y la faz del mundo en Azeroth ha cambiado por completo tras los ataques de Alamuerte, que han reducido a cenizas algunas zonas y han provocado violentos maremotos y terremotos que han partido literalmente la tierra en trozos, inundando algunas zonas y haciendo resurgir otras. Alamuerte ha vuelto con un solo objetivo, el de destruir Azeroth, y no se detendrá hasta conseguirlo.
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