Sudoku-9 Quilted Puzzles Catalogue
Group size: 9
Puzzle size: 21x21
Total number of puzzle types: 4
The Sudoku-9 quilted puzzle catalogue consists of puzzles that are made up of several (typically five or more) traditional Sudoku-sized puzzles 'quilted together' by overlapping parts of the puzzles to make one larger puzzle. Since these puzzles still feature a group size of 9, they are not conceptually harder to solve, but do, however, take additional time to solve due to their larger size and the additional empty cells whose values must be determined. Due to the interlocked nature of the puzzles, they can take significantly more steps to solve, since the solution of one of the smaller puzzles can depend on the solution of another smaller puzzle and the overlapping shared portion of the two puzzles.
Click on any puzzle thumbnail below for details and example puzzlesFour Puzzle Types with a Group Size of 9
| Puzzle | Thumbnail | Size | Elements | Group Sets | Group Count |
Derived Signature Puzzles |
| Sudoku-by5 Instructions |
 |
21x21 | 123456789 | 6 | 135 | 
|
| HyperSudoku-by5 Instructions |
 |
21x21 | 123456789 | 7 | 139 | |
| Sudoku-Xtreme Instructions |
 |
21x21 | 123456789 | 7 | 143 |  
|
| HyperSudoku-Xtreme Instructions |
 |
21x21 | 123456789 | 8 | 147 | 
|