This book has 100 Hard and Extreme Sudoku 16 X 16 Puzzles. Challenge yourself today with Sudoku Hard & Extreme Level Puzzles Sudoku is a fun and addicting logic puzzle game for improving your memory and prevent neurological disorder. This book is ideal for advance solvers, will love to solve this difficult Mega Sudoku 16x16 puzzles. Only 1 print per page. It is also ideal for those wanting to move on from the "Medium"...
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