The Door of Hours
The door behind the lamp is small and green, with a brass letter slot and no handle, no keyhole, no hinges you can find. Warm light leaks around its edges, and from beyond it โ faint, cheerful, entirely impossible โ come market sounds: a brass band, gulls, someone laughing at a joke you missed by two hundred years.
The cat flows off the Keeper's lap, crosses the room, and slips through the letter slot like the last line of an argument.
"The door only answers to its name," says the Keeper behind you. "No key ever cut will open it. You must say the name โ say it where names are said, up here, where you tell your machine where to go."
He nods โ at you, at the address you typed to get here.
"You've read the riddle. You've held the collar. You know what this town is missing. Speak the day into the bar at the top, after the name of this place, and the door will hear you."
(If you need it spelled out: look at the letter slot. If you speak wrongly, the fog swallows the word โ just come back and try again.)