- The Hard to Extreme Sudoku Puzzle Book: 120 Large-Print Puzzles Volume 2
- The Hard to Extreme Sudoku Puzzle Book: 120 Large-Print Puzzles Volume 4
- The Hard to Extreme Sudoku Puzzle Book: 120 Large-Print Puzzles Volume 3
- Samurai Sudoku: 500 Sudoku Puzzles Overlapping Into 100 Samurai Style
- Samurai Sudoku: 500 Sudoku Puzzles Overlapping Into 100 Samurai Style: Hard Level








