When the player plays this level for the first time, they will need to talk to a Bob Omb Buddy to activate the cannons. Afterwards, the player has to carefully refresh the cap every once in awhile by getting a new cap from the red [!] blocks.
They also have to avoid flying too low or falling into the bottomless void below. If either of these happens or the player fails to get all 8 red coins when reaching the lowest clouds, they need to retry the level.
Once Mario has successfully collected all red coins in the level, a secret Power Star will appear on one of the lower clouds, which is marked by the common, blue, rotating star.