Ending C: The Exchange
The brass key is warm. The moment you lift it, the footsteps stop, and every light in the building comes on at once.
You climb the stairs and walk out the front door into a city you almost recognize. The streets are the same, but the museum behind you is full of people, its banners bright, its doors propped wide. A poster reads: OPEN SINCE 1923.
In your pocket, the brass key fits a door you have not found yet.
This is one of three endings.