T K Lee
68 books • 4 series
The Active Brain
Book #3: 500 Hard Sudoku Puzzles
Book #4: 500 Extra Hard Sudoku Puzzles
Book #5: Large Print Sudoku
Book #6: 600 Sudoku Puzzles, Easy and Medium
Book #7: 600 Sudoku Puzzles, Medium and Hard
Active Brain Pocket Book
Book #5: 200 Easy Sudoku Puzzles
Active Brain Series 2
Book #2: Sudoku 1,500 Medium Puzzles
Book #3: Sudoku 1,500 Hard Puzzles
Book #7: Sudoku 1,000 Hard Puzzles
Book #10: Sudoku 300 Medium Puzzles
Book #12: Sudoku 300 Extra Hard Puzzles
Active Brain Series Pocket Book
Book #1: 300 Easy Sudoku Puzzles
Book #2: 300 Medium Sudoku Puzzles
Book #4: 300 Extra Hard Sudoku Puzzles