Blizzard Entertainment reported Friday that its game World of Warcraft: The Burning Crusade recently surpassed one million concurrent users in China. That's the highest concurrency since the game was launched in China in 2005.

World of Warcraft is a massively multiplayer online role playing game available for Mac OS X and Windows. The game was released in the United States in late 2004 and spawned an expansion pack, the Burning Crusade. Blizzard is presently working on a second expansion pack for World of Warcraft, the Wrath of the Lich King.

Blizzard works with The9 Limited in mainland China. The9 Limited operates online games in China, primarily licensed from other companies like Blizzard, but has also developed its own proprietary MMO.