If you don’t already know about it, Hearthstone is a collectible card game based on the Warcraft lore. Fans of the series will recognise characters from the games in many cards.
Hearthstone is currently in open beta but Blizzard have already updated their rules and guidelines for official tournaments, particularly for those offering prizes of $10,000 or more. Anyone interested will need to apply for an official community licence, you can find out more about that here.
I’ve been playing the beta myself and it’s really good fun, check it out at the official site.
An example of a duel:
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