Take the pipe to the next world, but it appears you are in for another boss battle. Another fun house descends to spoil your progress, so enter it. At the right side of the room, there will be a ?-Block that contains a Double Cherry, so grab it then ride then gondola.
BOSS - Motley Bossblob
Motley Bossblob is definitely an interesting boss, as he is surrounded by metallic blobs. All he seems to do is bounce around, trying to crush you, then does a belly flop maneuver. Whenever he does that final move, all of the metallic blobs will break from his real body, leaving him vulnerable. Attack him whenever the clown form is out and about to damage him, causing all of the blobs to go back, making his large body reform. Note that when the blobs disperse, you will find a Double Cherry mixed in with them, so make sure to grab it.
The second and third phases of the boss are the same as the first one, except he will bounce around a few extra times. There’s not difference in the amount of blobs that spawn in those phases, and you will still get a Double Cherry each time. Even if you bounce on the metallic blobs, it will do nothing to the actual boss, so it’s best to ignore them completely.
After three hits, Motley goes down and the Green Star is yours, so collect it, then go on to finish the level.