In 1990, Nintendo made only about 116 copies of its Nintendo World Championships game. Inspired in part by the movie The Wizard (a hilarious it's-so-bad-it's-good vehicle starring Fred Savage), the game was promoted across the country in a nationwide competition. The game itself was based on scoring points in three Nintendo Entertainment System games (Super Mario Bros., Rad Racer, and Tetris) within a time limit of six minutes and 21 seconds. 

The finalists were given the so-called "gray" cartridges of the game manufactured by Nintendo; about 90 of those cartridges are still in existence today. Now you can own one of those cartridges, which is on sale on eBay, and as of this writing, the high bid was at a staggering $98,400.86.

According to GameSpot, the reason this is considered one of the rarest, and most valuable, games in Nintendo's existence is because it never went on sale. If you wanted it, you had to win it, or get it from someone who did. 

In 2011, another copy of Nintendo World Championships went on sale in much better condition than this current cartridge for sale. That copy fetched $11,000.

But according to UPI, the poor condition of the cartridge shouldn't deter any real collector from buying the game, because the game is so rare that it can fetch staggering numbers. They spoke with Chris Scullion, games editor for ComputerAndVideoGames, and he gave the following analogy: "It's like finding the rarest Ferrari, but with a scratch -- you'd still buy it."

At the rate this auction is going, this is turning out to be the most expensive video game ever sold. Previously, the record was held by Family Fun Fitness (at about $41,000).

This game has a pretty interesting history in the world of Nintendo, as Mental Floss explains: "Stadium Events was released by Bandai in 1987 as one of the few games available in America that was made for the company's Family Fun Fitness mat, a soft, plastic controller you walked, ran, and jumped on to make the characters move. Nintendo bought the rights to the game and the Fitness mat in 1988 and re-released them as World Class Track Meet and the Power Pad controller. To avoid consumer confusion, Nintendo pulled all copies of Stadium Events from shelves and had them destroyed, but not before approximately 200 carts had already been sold. Of those 200, collectors believe that only 10 to 20 complete copies of the game exist today, making them a real rarity."