One person thinks of an object, animal, or person
The other players ask yes-or-no questions to figure out what it is
Ask one question at a time
Use each answer to narrow down the possibilities
Keep track of the number of questions asked
Try to guess the answer before reaching 20 questions
If you guess correctly, you win
If you do not guess correctly in 20 questions, the thinker wins
Take turns so everyone gets a chance to think and guess