Yes or no question games, and lateral thinking puzzles

Two words, "yes" and "no", are enough to build an entire game on. No cards, no board: just someone who knows a secret and others hunting it down with questions. It's the simplest game mechanic in existence, and it spawned a whole family. Here are its members, from the simplest to the most gripping.

Why does "yes or no" work?

Because every answer cuts the world in half. One good question throws away half the possibilities; ten good ones can isolate a secret among a thousand. The game isn't luck; it's how cleverly you cut. That's why this family of games never wears out: the mechanic is simple, the strategy bottomless.

20 Questions: the ancestor

One player thinks of something: a person, an animal, an object. The others get 20 yes/no questions to find it; whoever nails it thinks of the next one. It's been played for two centuries in cars, at tables and in waiting rooms, and it's one of the 7 games made of talk.

"Who am I?": the disguise

20 Questions in reverse: you're not hunting someone else's secret; you're hunting your own. The group pins an identity on you (an actor, a hero, a historical figure) and YOU do the asking: "Am I alive? Am I Greek? Have I been in a film?". The more famous the identity, the funnier the ordeal.

"Black, white, yes, no": the mirror

Here the mechanic flips: you answer a barrage of questions WITHOUT ever saying "yes", "no", "black" or "white". "What colour is snow?" "Like milk." "Do you want to lose?" "Far from it." Two minutes feel like two hours; one wrong word and you're out.

Lateral thinking puzzles: the family's masterpiece

And then there's the member that took the mechanic and built a whole mystery on top: lateral thinking puzzles. You're not guessing an object; you're unravelling a story with a hidden truth, where every "yes" opens a path and every "no" demolishes one of your theories. On PlayWhydunit the questions are answered by an AI Game Master, with six possible answers instead of two ("Partially", "You're on the right track"…), key clues you unlock one by one, and a leaderboard for those who ask economically. "Yes or no" in its most grown-up form.

How to ask like a pro

• Cut in half: a good question discards half the possibilities whichever answer it gets.
• General before specific: "is it alive?" first, not "is it my aunt's dog?".
• One idea per question: double questions bring blurry answers.

Want the full method? See the 6 techniques for asking smarter questions, and try them tonight on the Daily Mystery.