| title | ISBN-13 | year of publication |
|---|---|---|
| Sudoku: Easy to Medium | 978-0-8118-5625-6 | 2006 |
| Sudoku: Medium to Hard Volume 1 | 978-0-8118-5675-1 | 2006 |
| Sudoku Puzzle Pad: Medium to Hard: 2 | 978-0-8118-6117-5 | 2007 |
| Sudoku Vol. 2 Puzzle Pad: Easy to Medium | 978-0-8118-6116-8 | 2007 |
| Wordoku Puzzle Pad | 978-0-8118-5855-7 | 2007 |