Sudoku

9x9
9x9 with blocks
9x9 with diagonals

8x8 with blocks
8x8 with diagonals
8x8 with vertical blocks
8x8 irregular with vertical blocks
8x8 irregular with diagonals (may take a long time)

7x7 irregular

6x6 with diagonals
6x6 irregular

5x5
5x5 irregular
5x5 with diagonals
5x5 with irregular block

4x4
4x4 with block
4x4 with diagonals