The Genesis was a bit weirder with releases, there's numerous versions of different games floating around up here all the time. I know someone here on the forums was selling a "rare" Canadian version of Sonic 2 for $30 but that's still somewhat common up here and is maybe worth $5-$10. With some Genesis games the boxes and instructions say Genesis but the cart labels say Mega Drive on them, these I do consider to be Canadian as they have specific boxes and manuals not intended for anywhere else. I don't feel that way with the SMS games as everything was just made for another region and left as is. The new UPCs weren't even applied during manufacturing, they're on the outside of the case because the cases were already sealed shut with a sticker so the inserts couldn't be removed.