One person thinks of an object, person, place, or thing
The other players ask up to 20 yes-or-no questions to identify it
Questions should be specific and narrow down possibilities
The answerer may only respond with yes, no, or sometimes not sure
Players use each answer to eliminate impossible guesses
A guess can be made at any time, but it counts as a question
The game ends when the correct answer is guessed or 20 questions are used
If the answer is not found in 20 questions, the thinker wins
Take turns choosing the secret item for fairness
Keep questions clear and focused on categories, features, and details