Classroom Master Key or Main Building 1 Master Key is an item in White Day: A Labyrinth Named School and Remake.
This key is needed to open the most of the locked classrooms & Rooms in the Main Building,Section 1.
In the Original, It is found on the Door frame at the Main office, Main Building, Section 1.
In the Remake, So-young drop that Key to the floor when the Tree capture the So-young.
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