Blizzard announced that purchasing tickets from partner theaters you get the base game for free.
Members of the Regal crown club (whatever it's called) has a chance of 2 blizzcon tickets.
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I tried getting into it back when they had Chuck Norris, Mr T, and Verne Troyer do those comercials for the game. Never really got into it. I think this was before that cataclysm thing.