Mike Colloby

Books
How to Become a Top Sudoku Player : Techniques, Puzzles, Examples, Training Methods and Timing Charts for Hard and Extreme Sudokus How to Become a Top Sudoku Player : Techniques, Puzzles, Examples, Training Methods and Timing Charts for Hard and Extreme Sudokus
How to Become a Top Sudoku Player : Techniques, Puzzles, Examples, Training Methods and Timing Charts for Hard and Extreme Sudokus
2011