The board game "mastermind," for your computer. It's entirely playable and does what it says it will, which would usually warrant 3 stars for me, but one star is detracted by the poor quality of the design. It looks like an html website built by someone who just figured out how to make tables and embed images. But if you like the game mastermind and want to play it by yourself, this will do just fine to automate the process.