Students have to guess of what thing the person who is it is thinking by asking him or her at most 20 yes/no type questions. If no one guesses the answer after 20 tries, the answer is revealed. A "yes" answer earns the questioner another chance to ask, a "no" passes the asking on to the next player. Maybe your students are advanced enough to ask appropriate questions on their own, in my case to facilitate my weak ones I hand out a print I made with examples of questions. The first question on my print is, "Are you animal?/vegetable?/mineral? Then below that I have written outline style three catagories of questions: animal, vegetable and mineral. Under the animal heading my first question is, "Are you human?" Then I have written questions like, "Are you famous?" "Are you in this school?" "Are you a man/woman?" "Are you Japanese?", etc. In case the animal is not human I have, "Can I eat you?" "Can I ride you?" "Are you bigger than a _____?" etc. Under the vegetable heading I wrote questions like "Can I eat you?" "Are you delicious?" "Are you in Japan?" etc. And finally under the mineral heading I wrote, "Are you metal/plastic/stone/wood?" "Are you (blue)?" "Do I have you?" "Are you in the classroom?" "Can I see you?" etc. By using the print my students get a feel for asking questions in English and I have found many no longer need to refer to the paper. I hope you have good luck playing this great word game.