Gecko Run Rapid Fire Expansion. Use the Rapid-Fire Launcher to send up to five marbles onto your track in rapid succession at the push of a button! When they reach the end of the track, the marbles are collected in a magazine which can be quickly and easily reloaded into the launcher. Semi-automatic marble launching at the touch of a button! Two magazines hold marbles for easy launching, collecting, and reloading Cool extra: Over 20 additional pieces! The additional track elements mean that the marble run reach is expanded, so you can cover even more tiles, doors, windows, shelves and other surfaces.