Here's how to solve the door knocker puzzle in Another Code: Recollection and unlock the mansion door.
SHIBUMI, by Trevanian ( PDFDrive )
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Another Code: Recollection - How to Get Inside the Mansion (Door Knocker Puzzle)
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Another Code: Recollection - How to Get Inside the Mansion (Door Knocker Puzzle)
Another Code: Recollection - How to Get Inside the Mansion (Door Knocker Puzzle)