You don't have to be a Sherlock Holmes to play this game, but it sure helps. This game is perfect for all those detectives hiding inside each of us.
The premise behind this sleuthing game is that you have 21 guesses to figure out
what the questionee is thinking of, be it a person, place or thing. Elementary my dear, Watson!
Some people know this game as the 20 question game. I just like the sound of 21 better because it rolls off the tongue easier. Either way, you have lots of chances to guess correctly.
The trick to winning this game are the questions you ask. You need to ask the kind of questions that rule out as many variables as possible during the early rounds of questions. For example, a
strategy used in the ISpy game is to ask questions that would cut the observable space by half's. For example, "Is it on the right side of the room?", and then "Is it in the top part of the room?". With those simple
questions you could have just increased the chances of guessing the correct answer by 75%. The same principle can be used in this game.