Click on a door to choose, then press enter. It will reveal all except yours and one more. One of the two not yet revealed has gold, and one is empty. Tell it whether you want to switch or not by typing Y for yes. Then press enter twice.
The Monty Hall problem originates from a game show from the 60s. Should you switch, or stay on your door? The answer is always switch. To find out why, watch this video: https://www.youtube.com/watch?v=4Lb-6rxZxx0
