Secret Course 06
From the Super Mario Wiki
Secret Course 06 is the sixth secret course that appears in the Remix 10 mode of Super Mario Run. This secret course takes place in the sky and does not contain any enemies.
The course starts with a ? Block containing a Super Mushroom, which leads into two paths: a top path with many Long Jump Blocks floating in the air and a bottom path that also has Long Jump Blocks, Cloud Blocks, and Springboards, but will make players lose out on collecting the Bonus Medals. The first Bonus Medal is found above the second set of Long Jump Blocks on the top path. The second Bonus Medal is found above the fifth set of Long Jump Blocks on the top path. The last three Bonus Medals are all found right before the Goal Pole and can be collecting by jumping from the last set of Long Jump Blocks on the top path.