The Keeper’s Watch

Walk with W, A, S and D or the arrow keys, and click the view to look around with the mouse. On a phone there's an arrow pad, and you drag across the view to turn. Put the crosshair on anything that catches your eye and press E, or tap USE. Locks, notes and the keeper's things open in a close-up.

You have 25 minutes and four free hints. The keeper watches on a camera, the way a game master does in a real room, so a hint starts from whatever you looked at last, and the last hint for each puzzle gives the answer. After the four free ones, each hint adds two minutes to your time.

Pause stops the clock if you need a break, and Map shows a floor plan of what you've walked past so far. The answers change every time you start a new game, and your progress saves in this browser, on this device only.

A signal lamp by the window flashes a five-letter word in Morse code, and a card pinned beside it has the alphabet. Each dot lasts about 0.4 seconds and each dash three times that, so one pass of the word, with its long rest, takes between 15 and 21 seconds. You can hear it too, since the shutter clicks on every flash.

The logbook's last entry is a Caesar shift. The brass cipher wheel on the shelf is still set to the shift the keeper used, A under some other letter, so you can turn it back by hand.

Two endings are possible. Get out with the great light dark and the relief boat turns back. Light it first and the boat stands off the rocks.