Secret Course 20
From the Super Mario Wiki
Secret Course 20 is the twentieth secret course in the Remix 10 mode of Super Mario Run. This secret course takes place in the sky world. This course does not contain any enemies.
This course is made up of multiple cannons that the player must enter. The first part has four cannons going diagonally upwards to the right. A Red Ring appears in this section, allowing the player the opportunity to get a Super Star. The first Bonus Medal can be found rotating around a block and can be obtained by shooting out of the first cannon, the second Bonus Medal is found moving after the second cannon, and the third Bonus Medal is found moving after the third cannon by the Red Ring. Players then shoot out of a fifth cannon to the right into a sixth cannon, which shoots players diagonally downward to the right. The last cannon shoots players to the last two Bonus Medals, which rotate around two blocks, as well as into the Goal Pole.