Find the letter (Play & Learn! Series) In this app, you look for certain letters mixed in with the others and touch them on the screen. Try to find them as fast as you can! You can change the color of the problems from the Settings screen. Give it a try in your favorite color. There are hidden problems in the app. You can try them if you complete some condition. Enjoy mental calisthenics with this app by competing with your friends or family members in the ranking or by simply working to increase your own score.