Sheetdoku: Game that combines Sudoku with spreadsheets

That was fun!<p>The only thing I miss from other sudoku puzzles is being able to select multiple cells at once for adding pencil marks. They also have 2 kind of pencil marks, corners and centers. The one I played was easy enough to use a single type but for harder puzzles I can see me needing more.

This is a very interesting game. Thanks for sharing it.