Barnes and Noble
5 Golden Sudoku - Champion Level - Very Hard - Vol. 28: 50 Not Five Not Ten - "x" Diagonal - Central Points + 50 Killer "x" Diagonal Octagonal Star + 50 Puzzles 3 Numbers "x" Diagonal - Anti-Knight + 50 Even - Odd Puzzles "x" Diagonal + 50 Threelinesdoku
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