Acacia Key

The Acacia Key is obtained by Maria in the Born from a Wish scenario from Silent Hill 2.

It is found embedded in a gravestone, after climbing up a ladder inside the fireplace in Baldwin Mansion. The gravestone serves as the Acacia Key Puzzle, and after correctly placing the boards, the key comes loose and is able to be retrieved.

The key opens the locked door in the southern balcony on the second floor of the mansion, which leads to Amy Baldwin's room.