Nintendo has been in the video game industry for over 40 years. That means that there's been plenty of time for some games to become extremely rare and valuable. The rarest games are still for the NES since they have the most value when it comes to vintage and older games, and also tend to be harder to find. These games don't have to be good, popular, or even finished, to be valuable. As other Nintendo consoles enter classic collector territory, the list of shockingly priced games grows longer.