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I got the Gummy Koala on level 2 using Mabel. You just do the same thing as you would with Dipper. First step: Get Mabel on the first platform at full size, step 2: Make Mabel jump, and step 3: Shrink Mabel as she's coming down and then make her walk in between the crack. You have to be sure to shrink Dipper and Mabel at the exact moment though or they won't be able to get the Gummy Koala.