This is the collaboration page for Code Breaker. The entirety of Open School Games is a work in progress, but to keep things as simple as possible for those who just want to play the games we use collaboration pages to suggest and make improvements. We also use collaboration pages to help learn the art of web design and computer programming.
For example if the digits 1, 2, 3, 4 are behind the question marks and I guess 6, 4, 3, 5 the game will give me one open circle and one solid circle. The 4 is a correct digit, but not in the correct place. The 3 is a correct digit that is also in the correct place. From this information I can place another guess by changing one or more of my guesses and clicking check again. By reasoning and elimination try to guess the correct digits in as few guesses as possible.
See Mastermind board game for more information.