Musaic Box (Android) app for $0.99

Musaic Box is an unusual combination of mystery game and musical puzzle. It's your task to find the old organ master who has disappeared. Enter a world of music and magic to gather clues and solve various quests. Unlike other puzzle games, Musaic Box requires not just logic, but a sense of musicality. Correctly composed melodies will lead you to the mystery's solution and unlock a new game mode. Do you have an ear for music?++