Recently, Nintendo Japan released a Mario Maker Let's Play video on YouTube featuring a host who plays the game, a narrator and a small background audience group. Surprisingly, an American player named dan (starting at 16:46) took a chunk of the spotlight in the video because he created a hard survival course called Worm Survival which basically made the host take a lot of attempts. Also there are other hard American courses that the host encountered along with other foreign courses.
Check out the video. It's pretty hilarious even without knowing Japanese.