A cool $17,000 on eBay will net you every licensed NES game released, all 773 of them. Plus, the seller will throw in “a couple of licensed game variants such as gray and gold link and Zelda games.” Auction page.
Every game worked properly upon testing but that was a few years ago. There are maybe 5 -10 games that rate under an 8 on my rating scale. An 8 would mean that it has minor scratching to the cart and or label.