Something Awful have knocked up a guide to what was required in order to get the ‘Nintendo Seal of Quality’ stamped on their game, throughout Nintendo’s console history. You can see it by clicking on these words.
Best bit: “Works extra good when blown on.â€
The infamous seal was never intended to show consumers that a game was of a decent quality; it was used to prove that it was a legit copy, and not a pirate, and that it would actually work when you plugged it in.