Monty Hall

Explore Probability's Most Famous Puzzle

Should you stick with your first choice or switch doors?

Automated Simulation
Watch thousands of games play out automatically to see mathematical truth emerge
Choose strategy: Always Stay, Always Switch, or Random
Run up to 1000 rounds with 3-100 doors
Visualize probability convergence in real-time
Start Simulation
Manual Play
Experience the puzzle yourself by making your own choices and decisions
Click doors to make your own choices
Decide yourself: stay or switch after reveals
Track your intuition vs mathematical truth
Start Playing