501 Extreme Sudoku Puzzles: Expert Level Number Fun Find out how fun Sudoku can be! This book contains 501 puzzles, perfect for those people that like extreme puzzles. This book will keep you occupied from beginning to end. We filled it with relaxing and addictive, challenging brain games. It also has easy-to-follow instructions. They include easy start instructions with helpful tips to get you started. The Solutions are at the...
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