Very nice, except I can't believe there's no way to set the difficulty of the puzzle it generates! Also, it seems that there's no way to scale the puzzle when you use the "booklet" feature. It is too small on a high resolution screen, and since the program scales individual puzzles so nicely, it's odd that it doesn't scale the books. Also, it would be good if it could print more than one or two puzzles per page- ideally letting one choose 1, 2, 4, or 9 puzzles per page for printing. It would be great to be able to print the booklets this way. And when you do print one puzzle, the scaling of the print is based on the size the current window is, which can be confusing. Still, it's simple and has good features and a good game-play interface. Great price. The most important thing is to add a difficulty selector- ever puzzle it generates is too easy!