In just six months Blizzard’s widely-popular MMORPG, World of Warcraft, has added another one million subscribers.

A plethora of new and returning WoW addicts have flooded Blizzard’s game rooms during the holiday season

According to Blizzard’s definition a subscriber is anyone who has paid a subscription fee, has an active prepaid card or used an internet game room in the last 30 days. This figure doesn't include free promotional subscriptions, expired or cancelled subscriptions, and expired prepaid card.

Blizzard said that currently there are more than 2 million subscribers in Europe, more than 2.5 million in North America, while in Asia it seems like the game has become something close to a national sport with 5.5 million players.

"It's very gratifying to see gamers around the world continuing to show such enthusiasm and support for World of Warcraft," said Mike Morhaime, CEO and cofounder of Blizzard Entertainment. "We're always pleased to welcome new players to the game, and we're looking forward to sharing the next major content update with the entire community in the months ahead."

World of Warcraft debuted in North America on November 23, 2004, and since then it has become the most popular MMORPG around the world, practically dwarfing any competitor.

Blizzard is working on a new add-on, World of Warcraft:Wrath of the Lich King, which is scheduled to be released later this year.