Well, the one I'm talking about that "supposedly" exists, is just the joystick, & it has a cartridge port on it, & probably some built in games. I can't recall if the guy said if it had a port for a 2nd joystick. Oddly enough, the guy that told me about it, worked for Midway, & was involved in Thrill Kill, among other games. Anyways, maybe it's one of those things I'd have to find in Lil' Tokyo, or......maybe Big Lots? They seem to have alot of KO stuff.