Like many old people I am a big fan of Antique Roadshow, well it looks like the same sort of hysteria has arrived in certain old video games.

But this appears to be changing. In early August, an unopened copy of “Super Mario Bros,” released in 1985, set a new world record when it sold for $2 million on the collectibles website Rally. Produced for the original Nintendo Entertainment System (NES), it was the third vintage title to smash the record for the world’s most expensive game in under a month. A few weeks earlier, a sealed copy of “Super Mario 64,” from 1996, became the most expensive video game to sell at auction, fetching $1.5 million. In doing so, it broke a record set two days prior by an $870,000 copy of 1987’s “The Legend of Zelda.”