Rare Nintendo NES Cartridges Found in Wisconsin Could Be Worth Millions, Including Unknown Super Mario Bros. Version

A forgotten storage box discovered in Waukesha, Wisconsin, has become one of the biggest finds in video game preservation history. The box contained nearly 100 Nintendo Entertainment System cartridges featuring a rare version of Super Mario Bros. and Duck Hunt that experts had never previously documented. The discovery has attracted attention from collectors because the cartridges appear to have been produced years after the final known printing of these games. Their unusual labels, hardware components, manuals, and internal boards suggest…