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Pages: 130, Paperback, Independently published
Independently Published
Hyper Sudoku ●●●●● #4: 100 Very Hard Puzzles
Hyper Sudoku ●●●● #2: 100 Hard Puzzles
Hyper Sudoku ●●●● #5: 100 Hard Puzzles
Hyper Sudoku ●●●●●: 100 Very Hard Puzzles
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