How it works

Playing a quiz

• You get 10 questions, one at a time, in a fixed order. Everyone who plays that day’s quiz sees the same 10 questions in the same order.
• Each question has four answers. There is no timer, no hints and no second life. Your answer is submitted once, and reloading the page picks up exactly where you left off.
• A correct answer moves you straight to the next question. The first wrong answer ends the run there and then. Your score is how many questions you survived before that, not how many you got right out of 10.
• You do not need an account to play, and you never see a question you have not reached.

A new quiz every day

A quiz day runs from 00:00:00 UTC to the following 00:00:00 UTC. A fresh, numbered quiz opens at that boundary. If you are partway through a run when midnight UTC passes, you keep answering the same quiz you started, not a new one. Only a run you start after midnight gets the new day’s questions.

Difficulty

The 10 questions are ordered to get harder as you go: the first is meant to be easy and the last is meant to be genuinely difficult. That ordering is set when a day is scheduled, before anyone plays it, so it cannot be adjusted to a particular run.

Percentile

Once a day has enough completed attempts to mean something, your result shows how you compare, as “Top N% today”. Below that threshold, the result shows “Today's rankings are taking shape” instead of a percentile, rather than publish a comparison drawn from too few attempts to be meaningful. The threshold is 25 eligible completed attempts for that day. Test accounts, and any invalidated or abandoned attempt, are never counted.

Saving a result

You can play and share a result without an account. If you sign in afterwards, that result is attached to your account: it saves your streak and your history across devices. If your account already has an official result for that day, signing in never replaces it with a different one; your existing result stands.

Question review

Every question cites a public source. Before a question can be scheduled, an automated review opens that exact source, checks that it supports the stated fact and that exactly one of the four answers is correct, and requires an exact quoted passage from the source page, not a paraphrase. This is not a person reading each question by hand: it is a second, independent automated check that can never be carried out by the same process that drafted the question, so a question cannot approve itself. If a question still looks wrong once it is live, use “Report a question” below and it goes to review.

Reporting a question

Every result page has a “Report a problem with this question” link for the question that ended your run. Pick a reason and it is sent for review. Reporting does not change your own result, and a question is never silently rewritten after someone has already played it.