Hearthstone has been out in full release for just six months, but according to Blizzard, the free-to-play card game has already amassed 20 million players.

The official Hearthstone twitter account tweeted out the statistic today in the above graphic, writing, "Thank you all for joining us in Hearthstone! We're going to need a bigger tavern!"

That puts Blizzarrd's experiment with a new gaming model well above the current number of World of Warcraft subscribers (which currently hovers...

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