- First of all, that clue is not related to rescuing Arthur’s brother — it’s just a bonus element. To actually save Arthur’s brother, you can brute force your way through the maze (I’ve seen some patrons literally draw the map by hand, which also works), but the intended route is to obtain the “Someone’s Ring” item from a manual exploration on floor 9 of the Hideout. After spending about a day talking with Arthur and then showing him the ring, he will directly guide you through the maze. If you don’t want to go through all that, you can still bump your way around, figure out the path, and make it within the counter limit.
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As for the bonus element, I should apologize — due to a coding mistake (a single missing digit, small but critical), two of the blue arrows were not displaying. That meant it was impossible to actually reach the bonus area even if you deduced everything correctly. As you guessed, the logic is that you simply follow the red arrows, and when a blue arrow appears, you go in the opposite direction. With the missing arrows visible, it would have been solvable.
That said, the bonus is just a collectible — nothing important (no CGs, no characters, just a single line added in the survival notes). Still, I admit the bug was real and I apologize for the confusion. This issue will be fixed in the next update. Since it isn’t a clue tied to the rescue route, please feel free to ignore it for now.