Let's not get into the slippery slope that is a "complete" collection. Safest bet is going by retail releases. Once you start counting giveaway carts, prototypes and other random carts your going to extremes. There fun to own these games (personally have the snes ones) but I don't go out of my way to overpay for them either. If we start saying complete genesis, will we include the different variations such "sega classics" versions, paper box and plastic box versions, etc??? It's a road that never ends because someone will always want to be the "ultimate" collector by having everything for that 1 system.