The Monty Hall game demonstrates a counterintuitive but demonstrably true probability puzzle: In the game, you choose one of three doors. Only one of the three doors conceals a prize. The door you pick is not initially opened. Instead, one of the other doors that does not hide the prize is opened. Then you have an opportunity to change your choice from the door you originally selected to the other remaining closed door. Change your choice for the best chance of finding the prize.