A Couple of Japanese Guys Try to Avoid Green Mushrooms in Super Mario 64

This is called the Green Demon Challenge!

The name refers to something that is typically considered a boon in Mario games: the 1-up mushroom. Basically, you find and activate a 1-up mushroom but don't grab it. You try to collect all eight red coins in a level, as well as the star, without letting a 1-up mushroom catch up to you.