I just solved this, I was stuck here because I was overthinking it:
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× It's obvious, but the two trapdoors over water allows briar growth over them, while the trapdoors over pits don't (once they are dropped). Which means you can drop the trapdoors in such a way that the briar grows only horizontally.
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× If fluff is the problem because it grows over pits, what's the only thing you can use to stop it?
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There's not some other world out there where everything's gonna be okay.
There's just this one, just this rock.
-33th Skywatcher
[Last edited by Red-XIII at 09-09-2014 03:21 PM]