Missing Letters is an interactive, entertaining and simple way to improve literacy and word knowledge. Missing Letters incorporates the use of the Synphony Literacy System so that users will play the game only with words that contain the letters they are familiar with. The simple design allows for quick and easy play, with the gameplay screen containing 6 words with letters missing and the user guesses what the correct words are until all 6 words are correct. Missing Letters gives immediate feedback and performance tracking. Missing Letters is a great game to brush up on vocabulary, gain literacy in a language, or play for the challenge. Missing Letters is available on the iOS platform for iPhone and iPod Touch.