Abstract: A conversion system is described for adapting a home-play electronic game to coin-operated play. The electronic game has at least one access port for communicating with a remote controller, the access port including DC level connections and a plurality of signal line connections. The game exhibits both Attract and Play modes, the Attract mode being operative when power is first applied to the game, but not when the Play mode is in progress. The conversion system comprises a replacement user control panel that includes a start indicator and game control signalling devices. A power supply and coin receipt indicator are also provided. A timer is responsive to a coin deposit to enable the operation of the start indicator for a predetermined time interval. A register is provided which is connected to the signal line ports of the game and provides thereto, signals from both the start indicator and game signalling devices.