Remember the classic Master Mind game from the Seventies? It is also called "Bulls and Cows". You might know this game from your childhood as it is a digital version of the classic Mastermind board game. Now it's available for FREE for your phone and tablet. The goal is to guess the hidden color combinations. Your opponent (the computer / phone) creates a combination of up to four colors and hides it at the top of the game board. Your task is to try out different color combinations until you match the hidden code. After each try, you get a hint to see how many colors you have correct: -Black key: There is a color that is in the combination and at the right place. -White key: There is a color that is in the combination but not at the right place. The challenge is to pick the correct color code as quickly as possible — in other words, to see how fast you can guess the hidden color combination. Its a very addictive puzzle game. There are 3 categories of difficulty and 6 groups by dimension (3 pins, 4 pins, 5 pins, 6 pins, 7 pins, 8 pins). Each categorie has 50 - 1000 levels. There are more then 10000 tasks. Rules: https://en.wikipedia.org/wiki/Mastermind_(board_game)