- The Big Book of Numbrix 10x10 - 1000 Puzzles - Easy to Hard: Number Logic Puzzles - Brain Games for Adults with Full Solutions
- Hard to Extreme Sudoku - 300 Challenging Puzzles - Volume 1: Hard, Very Hard and Extremely Hard Puzzles for Sudoku Experts
- Hard to Extreme Jigsaw Sudoku - 300 Challenging Puzzles - Volume 1: Irregular Sudoku Puzzle Book for Adults with Solutions
- The Big Book of Jigsaw Sudoku - 1200 Puzzles - Easy to Extreme: Irregular Sudoku Puzzle Book for Adults with Solutions
- Sudoku Puzzle Book for Adults - 600 Puzzles - Hard, Very Hard & Extreme: Hard to Extreme Sudoku Puzzles with Full Solutions















