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9. Hexic HD – Grand Pearl Pooh-Bah
Those of us who bought our 360s early on were treated to copies of Hexic HD preloaded onto the hard drive. It's a fun little puzzle game with a surprising amount of depth, but those who attempted some of the game's achievements were left feeling very sore indeed. This particular achievement involved generating a particular gem through some difficult matches, and then surrounding six of them around any other piece. It's enough to break the will of even the most resolute of challengers.
