Mr. Balloon is a 3D exercise game played in 3rd person perspective where the player guided the central character so as to collect objects in the world. In order to eat an object, the character needs to be larger than it. To make the character larger, the player has to press buttons on the DDR (floor-based input controller). A heart rate monitor is used to control how often the player has to press the buttons. Technologies: Unity3D, DDR Pad, Heart rate monitor.