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Kunoichi Sudoku: Sudoku Kunoichi : 101 Extra Special Sudoku Variant Puzzles, 5 grids in 1 (Series #1) (Paperback) - Walmart.com
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Sudoku with two special rules: #1 The boxes that are diagonally connected by red dumb bells contain identical numbers. #2 The numbers that are connected through blue lines are each in total
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