These books contain puzzles with a group size of 7 and 8, presenting less of a challenge than traditional sudoku puzzles with a group size of 9. The 'Variations on Intermediate Sudoku' books contain a several examples of the different puzzle types available in this catalogue, with puzzles at all of the available difficulty levels. The 'Variations' books are available either by level, i.e., all the puzzles in the book are the same level of difficulty (easy, difficult, challenging, etc) or with all levels in a single (but much larger) book. For editions that are available in print, the on-line information includes detailed step-by-step solutions for each puzzle, as well as other general information about how to solve puzzles and use these books in classes.
| Book Title | Vol | Puzzle Count | On-Line Info | Edition Availability | |||
| Paperback | |||||||
| Variations on Intermediate Sudoku | 1 | 404 | Solutions | $7.99 | eStore | ||
| Easy Sudoku Seven | 1 | 190 | Solutions | $7.99 | eStore | ||
| Medium Sudoku Seven | 1 | 190 | Solutions | $7.99 | eStore | ||
| Difficult Sudoku Seven | 1 | 190 | Solutions | $7.99 | eStore | ||
| Challenging Sudoku Seven | 1 | 190 | Solutions | $7.99 | eStore | ||
| Easy Sudoku Eight | 1 | 190 | Solutions | $7.99 | eStore | ||
| Medium Sudoku Eight | 1 | 190 | Solutions | $7.99 | eStore | ||
| Difficult Sudoku Eight | 1 | 190 | Solutions | $7.99 | eStore | ||
| Challenging Sudoku Eight | 1 | 190 | Solutions | $7.99 | eStore | ||