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von Grol, Michael

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Anti-King Sudoku Volume 3: 600 Medium Puzzles
Anti-Knight Sudoku Volume 3: 600 Medium Puzzles
Anti-King Sudoku Volume 2: 600 Medium Puzzles
Anti-Knight Sudoku Volume 3: 600 Easy and Medium Puzzles
Anti-King Sudoku Volume 1: 600 Hard Puzzles
Anti-King Sudoku Volume 3: 600 Medium and Hard Puzzles
Anti-Knight Sudoku Volume 1: 600 Medium and Hard Puzzles
Anti-Knight Sudoku Volume 3: 600 Easy to Hard Puzzles