While " Vs. Super Mario Bros. " and "GoodNES 3.14" might sound like technical jargon, they represent a fascinating piece of gaming history involving a secret arcade version of Mario that was designed to be much harder than the one we played at home.
: This indicates a specific "home-ported" or hacked version of the arcade ROM designed to run on standard NES hardware/emulators. GoodNES 3.14