I think the level you mean is "
Monster's nest"
and not "
prologue"
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× Everything you said it's true, you have to kill brains and you must not drop the trapdoor.
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× If you look carefully there is a dead end in this room only that is not always accessible
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× Remember that snakes trapped into a door with no escape is like a dead end
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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