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This is the Volume 3 of 500 SUDOKU Puzzles Book Series by Tina Orville. You'll find in this book: 500 Sudoku puzzles for expert solvers, starting at the HARD level with solutions. You do not need to be a mathematical genius to solve sudoku puzzles. Only logic and a fair amount of training will allow you to overcome the most sophisticated grids. Advanced techniques are based on the same principles as other techniques. They are, in general, more difficult to detect.

This is the Volume 2 of 500 SUDOKU Puzzles Book Series by Tina Orville. You'll find in this book: 500 Sudoku puzzles for intermediates solvers starting at the MEDIUM level. Solutions included.

This is the Volume 1 of 500 SUDOKU Puzzles Book Series by Tina Orville. You'll find in this book: 500 Sudoku puzzles for beginners starting at the EASY level. Also included inside the book: Steps by step instructions, Tips & Tricks and Solutions, for new sudoku puzzlers.