There are plenty of collectors out there; comic book collectors, baseball card collectors,  even stamp collecting is still around these days. But there's a new collector's obsession these days: retro video games. These old-school NES and Atari games can fetch an impressive price, if you're lucky enough to find them, that is. Here's just a few of the rarest, and most profitable, gems out there.

1.) Stadium Events (Nintendo Entertainment System)

This game is so rare, even the box by itself is worth a good ten grand. Originally released by Bandai in 1987, Stadium Events was one of the few titles compatible with the Family Fun Fitness mat, a sort of forerunner to the Wii Balance Board, which allowed players to walk, run or jump on the mat to move the character on-screen. In 1988, Nintendo bought the rights to both the game and the fitness mat and re-released them as World Class Track Meet and the Power Pad, respectively. As a result of the purchase, all remaining copies of Stadium Events were removed and destroyed. About 200 copies of Stadium Events were sold before the recall, and out of those 200, there's only 10 or 20 left today. If you're fortunate enough to have both the game box and the cartridge intact, it'll net you anywhere between $15,000 to a record-breaking $41,000!

2.) Nintendo Campus Challenge (Nintendo Entertainment System)

Back in 1991, Nintendo held a contest where they traveled to various college campuses across the nation and challenged college students to get the high score on demo versions on 3 popular games: Super Mario Brothers 3, PinBot and Dr. Mario. Once the contest ended, the cartridges containing the demos were all destroyed, or so everyone thought. Turns out one Nintendo employee held on to the last copy of the cartridge and kept it in his garage before selling it in a garaged sale over 15 years later. As far as we know, there is only one copy of this game left in the world, and if you're so lucky as to have it, you can get around $20,000 for the game, easy.

3.) Nintendo World Championship (Nintendo Entertainment System)

Another promotional game compilation from Nintendo, this title comes from the 1990 championship tournament. Like with the Campus Challenge, contestant played for the high score on three different games: Super Mario Brothers, Rad Racer and Tetris. There are actually two different versions of this game. The regular gray-colored cartridge was given to the winners of the contest, and each of these 90 cartridges can sell for a solid $5,000. The much-rarer gold cartridges were given out as part of a promotion with Nintendo Power magazine. Less than 30 copies of these games were released, and if you've got one, you're sitting on a gold mine worth at least $15,000.

4.) Atlantis II (Atari 2600)

You may have heard of the original Atlantis for the Atari 2600, but chances are you've never heard of the sequel. That's because it was never actually released to the public. The developers of the game held a contest asking players to mail in their high scores on the game. However, several people maxed out the high score on the game, so to determine a winner, the developers created a more difficult version of the game, called Atlantis II, and mailed it out to the winners. This game was never mass produced and used the exact same cover art from the first game, so the only way to tell if you have the "sequel" version is to check the game's opening screen. It could mean the difference between a $3 game or a whopping $6,000 rarity.

5.) Uncharted 2: Fortune Hunter Edition (Playstation 3)

It's not just retro games fetching a high price. This collector's edition of Uncharted 2 was given away in a promotional contest, where the winners were selected at random from a pool of gamers who played the demo version back in October 2009. Along with the game, this special edition set also came with an art book, guide book, and even a full-size replica dagger from the game. If you were fortunate enough to win this bundle, you can net a nice $5,000 for it.

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