Player A (for example the host) writes down a ‘who’ or ‘what’ for player B. Player B has to look away so that the rest of the group can see who or what player B is. Then player B has to guess who or what he/she is by asking questions to the group. The group can only answer with yes or no. You can also have multiple players trying to guess who or what they are.
Make sure that everyone writes down for themselves the ‘who’ or ‘what’ of each player.