What to do there
5 steps. Tap one when it's done.
Build a tiny boat, test it in shallow water, and change the design if it tips.

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Any water deeper than a puddle: a creek, the lake, even a full bathtub.
5 steps. Tap one when it's done.
Bark floats because it's full of tiny air pockets, which makes it lighter than the water it pushes aside. A leaf sail catches wind the same way a real sail does: the wind pushes on the flat side and the boat has nowhere to go but forward.