These books only contain puzzles with a group size of 9 on a 9x9 grid. The 'Variations on Sudoku' books contain examples of many of the different Sudoku and group 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 information available in the eBook editions. 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 Sudoku | 1 | 384 | Solutions | $7.99 | eStore | ||
| Variations on Easy Sudoku | 1 | 32 | Solutions | Free | |||
| Variations on Medium Sudoku | 1 | 32 | Solutions | Free | |||
| Variations on Difficult Sudoku | 1 | 32 | Solutions | Free | |||
| Variations on Challenging Sudoku | 1 | 32 | Solutions | Free | |||
| Variations on Tournament Sudoku | 1 | 32 | Solutions | Free | |||
| Variations on Easy Education Sudoku | 1 | 42 | Solutions | Free | |||
| Variations on Medium Education Sudoku | 1 | 42 | Solutions | Free | |||
| Variations on Difficult Education Sudoku | 1 | 42 | Solutions | Free | |||
| Variations on Challenging Education Sudoku | 1 | 42 | Solutions | Free | |||
| Easy Sudoku | 1 | 180 | Solutions | $7.99 | eStore | ||
| Medium Sudoku | 1 | 180 | Solutions | $7.99 | eStore | ||
| Difficult Sudoku | 1 | 180 | Solutions | $7.99 | eStore | ||
| Challenging Sudoku | 1 | 180 | Solutions | $7.99 | eStore | ||
| Tournament Sudoku | 1 | 180 | Solutions | $7.99 | eStore | ||