They are seperate systems, but there was only ever like a half a dozen or so games made that run exclusively on the SuperGrafx (from what I have been reading, anyway) so unless you are a hardcore videogame console collector and need one to fill a gap in your collection, it probably would not be worth the megabucks these things sell for. They do play all the regular PC Engine games, but you can get a Core Grafx, CDROM and IFU30 for less and not miss very much.