Great, depending on device; you can also screenshot and print
This is a great app to play on my iPad. However, each puzzle is static - that is to say, you can’t zoom in and must play with the entire puzzle in view. Because of that, playing on my iPod touch was nearly impossible, as my big fingers would tap on the wrong squares two or three times before getting the one that I wanted. If you have a larger device and like Kakuro, then this is by far the best app. It also provides another useful puzzle source for old-school pencil-and-paper puzzlers like me. I take screenshots of the blank puzzles and print them out to do them by hand. With the high resolution quality of iPad screenshots, they come out fantastic, even when I print them on a full page at about 8x10” (on a standard 8-1/2x11” sheet). So if I don’t want to lug around my iPad (like when I’m waiting in the car to pick up the kids from school), I have a few of the printed out puzzles on my dollar store clipboard and I don’t have to worry about screen glare or battery charge. Also, the quality of puzzles here are MUCH better than others you can find online - I have tried dozens of websites and it isn’t even close.