ˌtwenty ˈquestions (also Animal, Vegetable or Mineral British English)
a game in which one person thinks of an object and others have to guess what it is by asking questions about it which can only be answered with ‘Yes’ or ‘No’. You sometimes mention the game when you think that someone is asking or making you ask too many questions:
Just tell me straight, don’t make me play twenty questions.

[TahlilGaran] Dictionary of Contemporary English ▲