20 Questions
speakingcommunicationwarmerpairsnone prep10-15 min
One player thinks of a secret noun. Others ask up to 20 yes/no questions to guess what it is. The constraint forces disciplined question formation, hypothesis narrowing, and strategic elimination.
Procedure
- Teacher demonstrates first with a secret word. Shows the class how to use broad-then-narrow questions (Is it alive? → Is it a person? → Are they alive today? → Are they famous?).
- Pair or small-group play: one student picks a secret word; others ask yes/no questions.
- Track the count — the 20-question limit creates the game. Each explicit guess (Is it a cat?) counts as a question.
- If solved in 20, the guessing team wins. Otherwise, the word-chooser wins.
- Swap roles and play again.
Why It Works
- Question formation practice at volume: a single game produces 15–20 questions per student.
- Strategic thinking in L2: good guessers use decision-tree logic (categorical questions first, specifics later) — this is transferable reasoning disguised as play.
- Low-prep, low-risk: works with zero materials; beginners can succeed in limited categories; advanced students are challenged by open "any noun" rounds.
- Inverts teacher-student roles: the student holds the secret knowledge, asks for yes/no only. Flips the usual information asymmetry.
Category Variations (by level)
| Level | Restriction |
|---|---|
| Beginner | Classroom objects only |
| Elementary | Animals, foods, or household items |
| Pre-intermediate | Jobs, sports, countries |
| Intermediate | Any concrete noun |
| Upper-intermediate | Add abstract nouns (freedom, jealousy, patience) |
| Advanced | No restrictions; include people, events, historical figures |
Variations
- Headband / Post-it Head (party variant): each player has a word stuck on their forehead — visible to others, not to them. They ask questions to guess their own word. See Who Am I.
- Passive-voice version: restrict questions to passive constructions (Is it used in the kitchen? / Is it made of metal?). Grammar-target focus.
- Hint bank: each player gets 3 "free hints" they can spend — reveals one feature without using a question. Strategy layer.
- Speed round: only 10 questions; harder, faster.
- Two-word challenge: secret is a two-word compound (ice cream, bus stop). Requires splitting hypotheses.
Tips
- First two questions should be categorical (Is it alive? Is it an object?) — teach this explicitly. Poor players ask specific guesses too early.
- Keep a visible tally of questions used. The scarcity is what makes the game work.
- Accept "sometimes" as an answer when honestly ambiguous — refine the question rather than misleading.
- For shy learners: let them be the word-holder first. Answering questions is less exposed than asking.
Source
20 Questions originated as a 19th-century American parlour game. Standard ESL adaptation documented in many TEFL resources (ESL Cafe, Games4esl, eslspeaking.org). A mathematical-information-theory analysis appears in Shannon (1948) — 20 yes/no questions resolve ~1 million possibilities in principle.