I FINALLY GOT THE FIRST GUMMY KOOLA ON LEVEL 2! WOO HOO! When you try to get that one, you should use Dipper because he jumps farther/further (I think both those words fit because they both mean the same thing). What you need to have him to is get him up to the first platform at normal size, make him jump, and as he's coming down right at the moment before his foot touches the two spaces you make him run in between them and then walk up to the gummy koloa. I don't think using Mabel would be the best choice because she doesn't jump as far as Dipper. If you want to try and use Mabel, then go ahead and see if you can get the Gummy Koloa using her, but again I think Dipper's the better option because he jumps higher. First I used Mabel to beat the game because she's my favorite, and then after I beat the game, I restarted from level 1, and now I'm using Dipper, and so far I'm on level 2 but only because I just recently began playing using Dipper, but what I've found out is, Mabel is faster than Dipper, Dipper jumps higher than Mabel, and when you shrink the twins Dipper shrinks a lot more than Mabel does. Once I get done using only Dipper for all 4 levels, I'm going to restart the game and use Dipper in level 2, and Mabel in levels 1, 3, and 4.