Stuck on classic level 20! – MultiMaze Review

I loveeeee this game, it's so addicting I wouldn't make any changes to it, except maybe if there was music or something but other than that it's awesome. Idk why people want it to be easier! What's the point of a easy game you'll beat in like two hours, then delete it. C'mon...  Anyway, I'm stuck on level 20, in the free multi Pack, I cant figure out how to get the balls to get to the opposite side of the maze but I got them to switch and open the little doors! Once I pass That stage I will be the happiest person on earth!  P.s. I already bought the other two packs. 
Review by jamesgirl07 on MultiMaze.