Abstract: A transmitter together with appropriate software are configured in the shape and form of a remote control unit for use with a handheld game player device. The transmitter may use a conventional radio frequency link to transmit commands to a radio controlled device such as a toy car. The remote control unit, consisting of the transmitter and a game cartridge, is inserted into the game device so that the game player device provides control input and display functionalities to and for the remote control unit. The game player may support synthesis, simulation and testing of a route to be traversed by the radio controlled device.