Monty Hall Simulator

This free Monty Hall simulator lets you play the famous three-door probability puzzle: pick a door, watch the host reveal a goat behind one of the others, then decide whether to stay or switch. Play round by round to build intuition, then auto-run thousands of trials to see the counter-intuitive result for yourself — staying wins about one third of the time while switching wins about two thirds. Every trial uses your browser's secure random source.