Every mystery so far.
Hour solved
Every day there is one mystery, and it is the same one for everybody in the world. It could be an object, a place, an idea, an animal or a person — always something almost anyone would recognise once it was named. You get five clues, but not at once. The first is deliberately close to useless: completely true, and almost impossible to act on. Each one after it gives away a little more, until the fifth practically says the answer out loud.
The whole game is deciding when to commit. Guess at the first clue and you take five points. Guess at the fifth and you take one. Get it wrong and the hand moves on an hour, which is why solving early is worth something and why an obvious answer at five o'clock is worth almost nothing. Most people land somewhere in the middle, and the interesting question is never whether you got it but how early you dared.
Finishing takes about three minutes, so the vault holds every mystery ever published, free and in any order. Vault puzzles give points but never touch your daily streak, so the streak keeps meaning exactly what it says. Points accumulate permanently and carry you up through the ranks, from Nightwatch to Grand Horologist.
There is nothing to sign up for and nothing to pay. Your progress lives in your own browser, which means it never leaves your device — and also that it does not follow you from your phone to your laptop. The game is paid for by advertising, including one optional video ad that trades a free clue for thirty seconds of your attention. Skipping it changes nothing about the game. The full rules are here.