3DRacers, the open source 3D printed racing game that you control with a smartphone:
3DRacers are 3D printed race cars that you can customize for free with their online editor. Once you have downloaded and printed your design, the electronics are a snap. The 3DRacer team has created an Arduino compatible control board that fits into your racer, allowing it to be driven with your smart phone using the on board BTLE radio. In the future, your 3DRacers will need to make pit stops for virtual tire changes and fuel ups as additional features are added to the control apps. You’ll also be able to upload your racing stats and prowess to the web, tracking lap counts and race times.