20 Questions: The 1780s Parlour Game That Became a Radio Hit — Rules and Strategy
Twenty Questions was being taught at London dinner parties in 1786 and became a radio sensation in 1946. The history, the "animal, vegetable or mineral" rule, why twenty questions can find one of a million things, and how to play well.
"Is it alive? Is it bigger than a cat? Does it fly?" Twenty Questions is deduction distilled: one secret, twenty yes-or-no questions, and a slowly narrowing circle. It is a car game, a classroom game and, for a while, one of the most popular programmes on radio.
Where does Twenty Questions come from?
Its early history is hazy, but by the 1780s it was established in fashionable London. On 7 February 1786 the writer Hannah More reported that she and a friend had been "teaching… the play of twenty questions" to prominent guests at a dinner party. The convention of opening with "animal, vegetable or mineral?" — borrowing the old three-kingdom classification of nature — followed, with its lovely edge cases (a wooden table is vegetable, because wood comes from trees).
The game became a mass-media hit in the 1940s. The American radio programme Twenty Questions was first broadcast at 8 pm on Saturday 2 February 1946, from New York's Longacre Theatre on the Mutual Broadcasting System; listeners submitted subjects, and Winston Churchill's cigar was the one they sent in most often. The philosopher Charles Sanders Peirce had already noticed the game's logical power in 1901, arguing that "twenty skilful hypotheses will ascertain what two hundred thousand stupid ones might fail to do" — an insight that information theory later made precise.
What you need
- Nothing. Our 20 Questions page supplies a secret (or lets you type your own), counts YES / NO / MAYBE answers and keeps the question count honest.
How to play Twenty Questions
- One player thinks of something — an animal, an object, a person, a place — and keeps it secret.
- Optionally they announce the kingdom: animal, vegetable or mineral.
- The others ask yes-or-no questions in turn. The answerer may say yes, no, or "sometimes" when honesty demands it.
- Any guess of the actual secret counts as a question.
- Guess it within twenty and the guessers win; run out and the answerer wins and chooses the next secret.
Strategy: how to win in twenty
- Halve the field with every question: "is it alive?", "is it man-made?", "is it bigger than a car?" beat "is it a giraffe?".
- Establish the category first, then the size, then the location, then the details.
- Do not guess until the field is small — a wrong guess wastes a question.
- Answerers: pick something specific but famous; "the Eiffel Tower" is fair, "my neighbour's left shoe" is not.
Variations
- Who Am I? — the secret is a person or character and the guesser is the one in the dark (Who Am I?).
- Ten questions — for younger children, with easier secrets.
- Team play — two teams alternate questions; the guessing team scores.
- 21 Questions — a different game altogether, a get-to-know-you question list (21 Questions).
Tips for hosts
- Keep a visible counter so the pressure builds.
- Let the youngest player be the answerer first — being the only one who knows is a thrill.
- For classrooms, restrict secrets to this week's topic.
Play 20 Questions now — free, no sign-up
Play 20 Questions online: the app picks a secret (or a player thinks of one), the group asks up to twenty yes/no questions with a big counter, then makes a final guess. Question suggestions included.
Frequently asked questions
How old is Twenty Questions?
At least as old as the 1780s: the writer Hannah More described teaching "the play of twenty questions" at a London dinner in a letter dated 7 February 1786. It became a mass hit with the American radio show that first aired on 2 February 1946.
What does "animal, vegetable or mineral" mean?
A traditional opening: the answerer says which kingdom the secret belongs to — animal (anything alive that is not a plant, including people), vegetable (plants and things made from them, so a wooden table counts) or mineral (everything else).
Why exactly twenty questions?
Because twenty good yes/no questions can separate more than a million possibilities: each question that halves the options multiplies your reach by two, and 2 to the power of 20 is 1,048,576.