As The Verge points out, it might not be the most expensive game ever, but it's certainly the most expensive one that's been professionally graded and certified.
The game was purchased by a group of collectors on February 6.
While the game itself isn't all that rare, this particular copy is, being one from an early 1985 test launch of the NES console in NY and Los Angeles.
That's the largest amount ever paid for a single video game and that's down to two reasons: the generally good condition of the still-sealed box and the fact that it's from one of the earliest batches of games released in the US. "In terms of rarity, popularity, and relevance to collectors, this game has it all". More information about the auction is available here.
Super Marios Bros originally came out in 1985 on the Nintendo NES console and was really popular. A ideal copy of that book sold at auction several years ago for $3.21 million. It was bought jointly by three collectors, who will share ownership.
The seller said he'd only consider offers of $100,000 or more, which takes most game collectors out of the running. You can buy a loose copy of the Super Mario Bros. cartridge for a few bucks. Put it into a box with some wear and tear, and you'll maybe spend $US50 ($70). The million-dollar comic book Action Comics #1 is far from the rarest comic book in the world, but it is the first print of the first appearance of Superman.