Extra Expert 9 is probably the hardest floor in Extra Expert. It's similar to Planets from Super Monkey Ball 2, there are 8 sphere shaped platforms that get smaller until you get to the last one. The size of the ball with the goal is the same size as the platform with the red goal in planets from SMB2. strangely similar in fact. Often, players may hit the Party Ball rather than the tape. Trust me, just go for broke.