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"Rust has almost completely eroded this key."
Rusty Keys are key items found in the Ruined House. Two such keys exist:
The first key is found in the possession of the frightened Little Girl on the west side of the first floor. Use it to briefly open the locked door on the first floor. It has no effect when used on the locked door of the second floor.
A second rusty key can be found in a chest on the second floor, in a bedroom with pink mildewed carpeting. Use it to unlock the locked door on the second floor, allowing you to use the right staircase to return down to the first floor. Doing so also permanently opens the locked door on the first floor.