4 x 4 ... 16 x 16

The program can solve puzzles of different grid sizes: 4 x 4 (the subgrids' size is 2 x 2), 6 x 6 (the subgrids' size is 3 x 2), 8 x 8 (the subgrids' size is 4 x 2), 10 x 10 (the subgrids' size is 5 x 2), 12 x 12 (the subgrids' size is 4 x 3), 15 x 15 (the subgrids' size is 5 x 3), 16 x 16 (the subgrids' size is 4 x 4).

4 x 4

6 x 6

8 x 8

10 x 10

12 x 12

15 x 15

16 x 16

The formats of sudoku files:

S4 - the puzzle with the 4 x 4 grid;
S6 - the puzzle with the 6 x 6 grid;
S8 - the puzzle with the 8 x 8 grid;
S10 - the puzzle with the 10 x 10 grid;
S12 - the puzzle with the 12 x 12 grid;
S15 - the puzzle with the 15 x 15 grid;
S16 - the puzzle with the 16 x 16 grid.