From: United States
I don't know about you, but when I'm doing the bigger puzzles, marking off the numbers (pix-a-pix) that I've used is helpful so that I don't have to keep counting where I am on a line. I hope this feature can be incorporated at some point. (It wouldn't have to say if it's right or not, just mark it off or allow the user the option to mark off the numbers.) Just my suggestion.