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Sudoku, which comes from developer Babaroga and publisher Microsoft, is one of the first two free ad-supported games for Xbox Live. It’s currently available in the US only, though it will likely debut in lands afar eventually as well. There are a ton of different sudoku games on Windows Phone already. This version is certainly not definitive, but it’s a pretty good way to get some free Achievements.

Head past the break for our full review.