Yeah the Ultra N64 is a cart converter. I really didn't want to go to the trouble of modding my original system, so I decided on that, which I paid $20.00 for. I paid about $30.00 for each game, which may be a lot but I never find these in the wild only on ebay. So I decided to pick them up since they were in very good condition and had all inserts and packaging. Starfox 64 is missing the Rumble Pak, but they threw one in for me.