Daily Windoku available on this site
Published at Tuesday August 1, 2006
I have done a lot of research into the Windoku format, with 4 window panes that also require digits 1 through 9. This variant is also known as NRC sudoku. I also make these puzzles for magazines, so I wanted to fine tune my rating system for this variant. Having completed the code, I can now generate Windokus in any grade. The best are posted daily, complete with an archive and print option.
One would expect a puzzle with more constraints to be easier. Not so. These Windokus are packed with interesting solving opportunities. Some of these cannot be found in regular sudoku, but every trick you've learned for Sudoku can also be used in a Windoku, even BUG and Unique Rectangles. I found an amazing 38 cell BUG in an earlier Windoku.