this page you can find 7x7 Sudoku puzzles with hemmed areas in a diagonal pattern
(see also the image on the right). The visible numbers are either
arranged in symmetrical patterns or unordered. You can create both variations
with the current version of the MaaTec
Sudoku program. While the symmetrical Sudokus often look more appealing,
the generator algorithm can create unordered Sudoku puzzles with slightly more
consistent difficulty. Just try both kinds of puzzles to find out, which of
them you like more.