A sealed, mint copy of this 1991 game is considered "one of the holy grails of NES (Nintendo Entertainment System) collecting," according to its seller.

Cartridges labeled "not for resale" (such as this one) are rarer than those without such labels: they were meant to be used in stores to demo games when they first came out,

according to Micro-64.

The seller originally listed this game for nearly $6,000, but ended up selling it for about $4,800. Clearly, they were looking for a serious buyer: 

"DO NOT buy this game with

the intent of opening it or using it," the seller wrote in the game's description. "I can't imagine why anyone would anyways but opening & using this game would completely destroy

the collectors value of the game and its historical significance."

This game sold insanely well even though it was in "good" condition. (On eBay, "brand new" is the best condition possible, then "like new," then "very good," then "good,"

then "acceptable.") Anything can happen if you get in touch with the right buyer!

Forget PokemonGo — a brand new, sealed copy of this 2001 game racked up hundreds when it sold in September.

Know your games' worth! Bidding on a used copy of this ultra-rare 1987 game began at $300.

This 2001 game "is the first Mario Party game to introduce Princess Daisy and Waluigi as playable characters," writes Super Mario Wiki. 

Versions of this 1987 game with *gold* cartridges sell for the most. Bidding for this copy started at just 99 cents.

Selling this black label, first print, gold-grade copy of Halo: CE tore its original owner apart. 

"The first print of the fantastic franchise that has changed gaming forever. To my

knowledge the gold copies of this game can be counted on one hand," the seller wrote in the game's description. "I hate to sell something that I know I'll never see

again, but my kids are more expensive than I ever could have imagined."

When this game first came out in 2000, retailers sold it for about $55.

"The game is not in perfect condition, but great for how long it has lasted," the seller noted in this 1998 game's description. Sometimes that's all that counts!

Though this horror survival game was released on multiple platforms, its Playstation 1 version brings in the most $$$$$.