1. The computer has picked a four-digit code. Can you figure it out and enter it on the keyboard?
2. Each digit can only be used once.
3. After typing in your guess, press the Ā«CheckĀ» button.
4. If you see two matches, it means two of your digits are in the right place. A mismatch means one of your numbers is correct but in the wrong spot. We won't tell you which digits match or mismatch.
5. Sometimes your guess might not match any digits. This is great because it eliminates four digits at once!
6. Every time you make a guess, the cloud gets a little stormier. If the storm clouds fill the sky before you guess the code, you lose.
7. You can play as long as you want! If you start a new game, the clear skies will return.