Apples
During chapter 3, let your new friend eat every apple you can find. There are 4 you can miss, the others are easy to spot and you won’t miss these.
Other GRIS Guides:
Apple 1
Apple 2
When your little friend goes to the top to slam the stone blocking the path, quickly go back to the right so your friend follows you.
Apple 3
Apple 4
The fourth one is after the big slide, find your little friend and walk back to the right.