HBO has unveiled Win the Throne, a social networking game featuring minigames, intrigues, and various rewards. Grand prize? A cool $10,000, plus there’s an additional prize for Comcast subscribers only of $10,000 (only one grand prize per winner). Plus a number of lesser prizes, like gift cards, T-shirts, and so on.

The game sounds fun. The only downside? It’s U.S. only, at least as far as prizes go. Ah, well. The minigames sound like they may be fun to play all on their own, even if you don’t play the game of thrones…