I’m thinking of something. Can you get it in twenty questions?

A fair game of twenty questions where the assistant guesses and shows how it narrows things down.


When to use
In a line, on a train, or the first time you want to watch how an assistant reasons.
Time
10 min

The prompt

Let’s play twenty questions. I’m thinking of , and you have to work out what it is. Ask one yes-or-no question at a time and number them. I can answer yes, no, sort of, or I don’t know. After every fifth question, give me one line on what you’ve ruled out and what you’re choosing between. Don’t guess until you’re fairly sure, because a wrong guess costs you two questions. If my answers seem to contradict each other, say so and don’t work around it. When it’s over, win or lose, tell me which question did the most to narrow it down.

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