Become a Sudoko NInja, Gain the mental speed and alertness of a Ninja as you work your way up the ranks and finally achieve the supreme rank of Master Ninja.Sudoku puzzles to stretch your brain cells, bring you frustration, and provide you with a great sense of achievement. Enjoy the Beginner level...Hira Level and then work your way up the Ninja Ranks. There is one book for each level
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