Picture of a modified 9x9 Sudoku
This is a 9x9 Sudoku that was modified via the 'Edit Visible Fields' function
so that the visible pieces are arranged in a diamonds pattern. You can save
such patterns to reuse them with other Sudokus. Since version 1.6, the
MaaTec Sudoku program can also
create Sudoku puzzles that display the visible cells as symmetrical patterns.