Hard to Extreme Sudoku Puzzles
Playing Sudoku is addictive, and you can never have enough puzzles. When you become a skilled player, you may want more challenging puzzles.
In this book, we have:
100 hard puzzles,
100 very hard puzzles
and 100 extreme puzzles.
Each page has four puzzles, and all the puzzles are well-crafted and easy to read.
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