Nintendo has provided a new course for Super Mario Maker, based on the NES Remix series. After completion, it will net you the frog suit from Mario 3, which wasn't in the game previously. I'm glad Nintendo has taken the criticisms to heart and started added in new content like this and checkpoints over time.
As you can tell from the video, the level is extremely easy. So if you have nothing to do this weekend, go ahead and grab the frog suit.