Have students sat in a large cirlce. Select a detective that will leave the room. With the rest of the group, ask them for ideas regarding an object at random in the room that can be used (similar to "I spy with my little eye"). Once the object has been selected, have the detective enter the room and stand in the middle of the cirlce so the game can commence.
The coach will ask questions at random; "is it the door?" "Is it the windows?" "is it my shoe?" etc and the detective will answer with a "yes" or "no" as to what they think the object is. If the detective guesses correctly, they will win. However if guessed incorrectly, they lose and the object will not be revealed. Once rounds are finished, select another detective and another person to choose a random object.
 
There is a riddle as to how this can be solved so the detective wins....