Bull and Cows for

From TB Labs:

Bulls and Cows - the world-famous logic game! It absorbs you and forces you to think deeply to correctly guess the arrangement of the eight, nine or ten-digit number generated by the computer or thought of by the another person. After each guess, your score is given in terms of black and white balls. The black ball means, that one figure is guessed and it stands on the right place, the white ball means that you have guessed one figure but it stands on the wrong place. Play this game with your friends and find out who is more quick-witted. You may use the high scores table to keep your results and then compare them. You will get real pleasure from playing this game!