Fun, Challenging

If I had any complaints, they would be that (1) the application is sometimes too helpful and (2) the training feature (hints) doesnt go far enough in some of its explanations (e.g, in unique rectangles, why delete this rather than the other number when both seem available for deletion?). But those are quibbles. The application is great on all levels and provides many levels of challenge. I tend to stay at the middle (difficult) since spotting and dealing with fish is too difficult for me.

kopfschlaeger about (heart) Sudoku