Xbox.com Prima Guides
 

Lost in a particularly difficult level? Can't figure out how to beat that one boss? Wish you knew how to unlock that last character? Prima has you covered with guides for all your favorite Xbox® titles. The world's leading publisher of official game guides and the exclusive guide publisher for Microsoft®, Prima continues to dominate the field it created in 1990 by providing the highest quality game guides available.
Get the best tips, maps, hints, and strategies from Prima's experts, and take your gaming further than you ever thought possible.

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News source: microsoft.com