Galaxy Game runs on a PDP minicomputer hardware which does not have a standard CPU or rom chips. That will be very difficult for mame to emulate. MAME can only emulate games at cpu levels. This game was released before Pong came out. Don't expect this game to be emulated anytime soon since it will be extremely difficult emulate this without a standard CPU or rom chips. It may be months or years before this game will be added to mame.