Barnes and Noble
Sudoku Gold - Champion Level - Very Hard - Vol. 21: 50 Onefiguredoku "x" Diagonal + 50 Threelinesdoku Sudoku + 50 - 2 Pointsdoku - Anti-Diagonal + 50 Not Five Not Ten - Anti-Knight + 50 - 4 Towers "x" Diagonal. This Is Excellent Sudoku for You.
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