First off what parent in 1986 forgets to give their kids a copy of Super Mario Bros!? Maybe the kids got duplicates that year... that is the only explanation I can come up with, but good thing it was forgotten for 35 years.
Previously at auction the most expensive Super Mario Bros copy sold was for $156,000. This copy sold for over $660,000!
This super peppy sounding man from YouTube can walk you through exactly why it sold for so much, but it really comes down to the fact it's still shrink wrapped in mint condition!
This got me thinking back to all the toys as a kid my parents got rid of at a tag sale that are most likely worth a good amount now. Our She-Ra Crystal Castle ... found it on Ebay for about $400 now... but imagine in 20 more years!