Maker: Nintendo 
Original Price: Unknown*
Worth Today: $41,300*

The rarest of all the US licensed Nintendo Entertainment System games is Stadium Events. Only 200 copies were produced in 1987, with only 10 or 11 of the original American version around today. The game includes a mat that is made to exercise on while paying. 

The predecessor to Dance revolution and Wii has become the stuff of legends in the gaming community and stories pop up from time to time of someone finding the game in a thrift store or in their garage. 

In this case, one lucky owner found their copy lurking in the attic at their childhood home, unopened and unplayed. After listing on eBay they were astonished to find just how much it actually sold for. The market for rare games is alive and well!