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Twenty Questions

Ten subjects, 20 questions each, one 20-minute clock. Multiple choice is scored instantly, and your 3 written answers are graded by AI, with an explanation for every question.

Start with Claude Play in your browser

With Claude: sign in with your own Claude account (a free one works). The first time you submit, Claude asks you to allow it, and grading uses your account's usage. Best grading and feedback.
In your browser: no account needed. Written answers are graded by a small AI model that runs on your device, so it's less precise. You can mark an answer correct yourself if you disagree.

How it works
Pick a subjectAll 20 questions on one page, answered in any order.
Beat the clock20 minutes. When time's up, it submits for you.
AI grades17 multiple choice plus 3 written answers, judged on meaning, with feedback on why you were right or wrong.
Subjects