It does seem impossible doesn't it, probably because there are 6 paths leading off of the island that it connects to. What that means is you'll have to
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×do something strange to drop the trapdoors in one of the paths. The only one where something like that might work is the one with the bridge.
If you're curious what to do in that area I'd like to point out that
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×platforms can go under briar, which lets you get near the bridge with the platform.
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If you need to think outside of the box, then you didn't build a good enough box.
