You can download Sudokus with 8x8 cells from this page. The inner areas can
not be square for this kind of Sudoku puzzles. Currently the
MaaTec Sudoku program can create 8x8
Sudokus with three different patterns for the inner areas. These are named
according to the arrangement of the areas:
Brickwall
Ladder
Cross
The program contains an individual board graphic for each of these patterns.