Really like these kinds of puzzles. But the action buttons don’t work well. I can’t get “Undo” to work. You can only get “Check” to work immediately after you place a number string into the puzzle. Placing one number in one square is difficult and strange. You have to click on a number string from the list that is the wrong length of the column/row involved, then click on the exact space you want to fill, and a tool to enter single digits will appear. These issues need to be resolved. But the game is playable despite these issues.

Won’t let me put in the correct numbers where they go

I love these puzzles but not working on iPhone 5. The line at the bottom to see the set of numbers to choose from is not selectable. It is too low or too small.

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!!