In the NES Duck Tales game you have to go around and make Scrooge collect lots of money, and the most money (other than the treasures that you have to find all over the world) is to be found in the bonus stages. But how do you get there? Are they random?
Good news for you, they're not.
First, find Launchpad in a stage, and he'll offer to take you home. If your 10,000s digit is a 7, he'll take a detour to a tract of sky where Gyro flies along spewing big diamonds for your taking.
And, thanks to reader seamartin00, we have a video to help illustrate
It seems so much easier when you know how to trigger it.