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Your confidence is your chance of being right. Say 70% on ten questions and you should get about seven of them right. Most people are surer than they are right; the game shows you by how much.

Each answer scores 100 − 400 × (confidence − outcome)², where the outcome is 1 if you were right and 0 if not. So 50% always scores 0, 100% scores +100 when right and −300 when wrong, and 80% scores +84 or −156. The best strategy is to say exactly how sure you are; the research page explains why.

Your type compares how sure you were with how often you were right: Bluffer (way more sure than right: 15 or more points over), Too sure (5 to 15 points more sure than right), Spot on (your confidence matches how often you're right, within 5 points), Too modest (5 to 15 points less sure than right) and Playing it safe (15 or more points less sure than right).

Yes. Choose a topic and difficulty, play ten questions, then try another round. New rounds prefer questions you haven’t seen. Your streak counts the days you finish at least one round; missing a single day doesn’t break it.

A pack keeps to one subject, such as History, Languages or Memes. Easy starts with familiar ideas; Normal mixes straightforward questions and close calls; Brutal tests deeper knowledge. A pack is offered only at difficulties with enough questions for a full round.

No. There are no accounts and no tracking. Your browser keeps a random id so your streak survives a reload; we never store your IP address or an email. Your anonymous answers become part of a public research dataset (see research). If you add a nickname to a challenge link, it is shown to the people who open that link. Details are in the privacy policy.

Questions combine sourced Wikidata comparisons with individually written questions, including history, languages and memes. Every answer shows its source. You can report a question that looks wrong right under its answer.

Yes. The full assessment takes 5 minutes: twelve two-choice questions with a confidence rating and six 90% ranges, then a chart of how sure you were against how often you were right.