Each Cryptogram puzzle is a secret message created by substituting letters. To put it simply, one letter stand for another.
Tap a blank space to highlight it, then select a letter from the keyboard to fill the space with your guess. You can also use the delete button to change you guess at any time.
Choosing a letter for a blank space will automatically add that letter to the other words in the cryptogram.
If you get stuck, use a Hint. Tapping the Hint button will give you a random letter that you haven't decrypted yet. Once all letters are decrypted, the cryptogram will be complete.