Apr 15, 2014 - Independent developer Pedro Nunez today announces Undo 4 (1.1), an update to his musical puzzle game for iOS devices. Recently upgraded to an English version, Undo 4 is a challenging amalgamation of touch, sight, and sound. With four circles that react differently to each other's moves, players must line up the jumbled up circles and return them to center. When the circles are lined up you beat the level. Each time circles are moved, they make a sound, creating a melody while the game is played.