Despite bad reviews, I thought I'd try cause I love these puzzles! I'm using an iPhone 3G (old school!) and the app is working just fine. To select, you choose the number of digits the number is you want to place and then select the specific number from the list of numbers with that many digits. No trouble whatsoever ;)
Hey Katdawg789... Maybe you shoulda read the directions! You don't add any numbers, you situate them in the puzzle so each is connected. They only fit one way!!