The leader thinks of an object. The object chosen must be a concret object made of matter, not an abstract idea such as “Truth” or what not.
The person just under him in the user list asks the leader a question that can be answered with “yes” or “no.” The next person does the same until the object in question is guessed. Whoever thinks he knows the answer can shout it out at any time, but if he is wrong, he is out of the game.
When the object is guessed, the next player in the user list becomes leader.