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there seems to be a bug with the snail hint puzzle for the movable block. We push the rock north, then back, then north, then back, west, then back, west again, then back, and finally south. Just as the hint says we should. Nothing happens. We pull the lever (the lever isn't mentioned in the walkthrough) and nothing happens. We've tried a lot of variations but nothing works, despite using the N2, W2, S1 code and knowing that there's supposed to be a secret wall opening. Are we missing something or is it a bug?