Back in the day nearly everyone had a Nintendo. Due to the console’s popularity, there are a large number of collectors willing to pay the equivalent of a new car for some of the system’s very rare carts. Check out below some of the most expensive and rare games. Do you own one? let us know below!

1. STADIUM  EVENTS

Price Range: $2,600 – $41,300; $10,000 for the box alone

Why So Expensive? 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 game characters move. Nintendo bought the rights to the game and the mat in 1988 and re-released them as WorldClass 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 about 20 complete copies of the game exist today, making them a real rarity.

Stadium Events made headlines in 2010 with two high-profile eBay sales: A North Carolina woman was cleaning out her garage and found an old Nintendo and a handful of games, including Stadium Events. She put them up on eBay without high expectations and was amazed to see the bids steadily climb up to $13,105. While the game itself is valuable, the winning bidder was most interested in the cardboard box in which it came; since most kids threw the box away after tearing open a new game, intact boxes for any title are really hard to come by, but especially so for Stadium Events. Empty Stadium Events boxes have been known to sell for $10,000 alone.

After hearing of the success of this eBay seller, a man in Kansas dug up a factory-sealed copy of the game that he was just about to donate to Goodwill. He had purchased the game in 1987, but could never find the fitness mat to go with it. It was still sealed because he’d meant to return it. His game became only the second known sealed copy in existence. When his eBay auction ended, the game sold for an amazing $41,300.

Earlier this year, another sealed copy of Stadium Events sold on eBay for $35,100, meaning the game has lost a little bit of its value, but not much.

The same game repackaged by Nintendo, World Class Track Meet, generally sells for about $5 on eBay.

2. 1990 NINTENDO WORLD CHAMPIONSHIPS (GRAY AND GOLD EDITIONS)

Price Range: Gray: $8,500 – $20,200; Gold: $26,677

Why So Expensive? In 1990, Nintendo held a 30-city gaming tournament to find the best player in the world. Players had to get the best score in demo versions of three games—Super Mario Bros., Rad Racer, and Tetris—all within a six-minute time limit.

At the end of each city’s tournament, the winners of each of three age groups were given special gray Championship cartridges exactly like those used in the competition, meaning only 90 of these cartridges were distributed. A gold version was sent out to those who won a promotional contest in the pages of Nintendo Power magazine. Only 26 gold games were produced, so they’re especially hard to find and command a higher price today; the last one to sell on eBay went for $26,677.

3. NINTENDO CAMPUS CHALLENGE

Price Range: $14,000 – $20,100

Why So Expensive? In the early 1990s, Nintendo held competitions on college campuses and at popular Spring Break destinations. Like the World Championships, players had six minutes to play for high scores in demo versions of three games: Super Mario Bros. 3, PinBot, and Dr. Mario.

Most copies of the game were destroyed after the competition tour ended, but one Nintendo employee kept his cart and sold it to Rob Walters at a garage sale in 2006. This garage sale is legendary among retrogamers, as Rob bought all kinds of NES Holy Grails for only $1,000. By the time he resold everything, he’d made 50 times that. Part of that $50,000 was the Campus Challenge cartridge, which went for $14,000. Shortly after, the buyer of the cart, collector J.J. Hendricks, turned around and sold it on eBay for $20,100. As far as anyone knows, it’s the only copy of the game in existence.

Super Nintendo Entertainment System

Although not quite as ubiquitous as the NES, the SNES was still a very popular game console. With more than 700 titles for the SNES fan to collect, there are bound to be a few that demand a high price.

4. EXERTAINMENT MOUNTAIN BIKE RALLY & SPEED RACER COMBO CART

Price Range: $1,500 – $3,700

Why So Expensive? Back in 1994, the exercise equipment company Life Fitness released the Exertainment System. As the cheesy name implies, it was a combination exercise bike and entertainment system with a TV screen built into the console. Now gym rats could watch regular cable television, Life Fitness exercise programs, or play games on the built-in Super Nintendo using specially designed controllers split between each handle of the bike.

There were two games made specifically for the Exertainment System: Mountain Bike Rally, and Speed Racer, based on the popular Japanese cartoon. While Mountain Bike Rally was available as a standalone cartridge, Speed Racer was only available as part of a combo cartridge that also included Mountain Bike Rally. Gym owners could buy either of the cartridges with the Exertainment cycle, but they could be purchased through retail outlets as well. Of course the bikes were expensive and very few people had one in their homes, so the retail versions mostly went unsold. As the Exertainment cycles were replaced by newer equipment, most owners simply threw the cartridges away since they weren’t compatible with a regular SNES. Naturally, this means they’re pretty hard to come by today.

While a loose copy of the Mountain Bike Rally cartridge sells for about $25, a factory sealed retail copy can go for anywhere between $50 and $350. But it’s the combo cartridge that is especially valuable with completist SNES collectors, bringing in over $1,500 for a loose cartridge, and nearly $3,700 for a factory sealed copy.

5. SUPER COPA

Price Range: $400 – $6,900

Why So Expensive? The story of Super Copa is a bit confusing for collectors: The game was a South American version of the North American soccer game, Tony Meola’s Sidekicks Soccer. Released in the mid-1990s, it’s merely a decent soccer game for the SNES. Although it was available in South America through a distributor named Playtronic, there is a second version of the game with different box and label artwork, that doesn’t include the Playtronic branding anywhere. This has led some to speculate it was also released in North America by a different company, American Softworks.

Whether it was released here or not, the alternative version of the game is hard to find, so naturally collectors are clamoring for it—so much so that bootlegs from Brazil have started cluttering eBay, making buyers wary of spending too much on a loose cartridge. However, if the original box is part of the auction, the prices can go as high as $400. And, if the auction is a factory sealed copy in exceptional condition, it could fetch as much as $6,900.