You can download 12x12 Sudokus from this page. The inner areas of these Sudoku
puzzles are non-square. The Sudoku
program can create the following pattern variations:
Cross
Short & Long
Ladder
Brickwall
The 'Ladder' pattern is contained in the board packages 'Wood & Glass'
for 10x10 and 12x12 Sudokus and in 'Stars with Signs of Zodiac' that are offered
for download on the MaaTec
Sudoku Boards page.