Super Mario Bros. (special edition)

The winners of Famicons F-1 Grand Prix tournament got a yellow-cased version of Super Mario Bros. that came in a plastic box modeled after the Disk-kun character who Nintendo used to advertise their Famicom Disk System. Only 10,000 units of this version were produced and it was never available for retail sale, therefore being the rarest of all Game & Watch games. The part number for this game is YM-901-S.