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Detective Conan - Conan and Heiji's Reasoning Magic: The Resolution
Seizoen: 14 - Aflevering: 19 / 515 - Eerst uitgezonden: 01 augustus 2005 - Episode ID: 405958
The mystery is solved and Heiji shows that it involves how the house is built. They reveal the hallway has mirrors on the door with identical rooms on the side to cause an illusion.