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Bulls and Cows Game is also known as MasterMind. Computer selects a four digit number, all four digits are different. In current implementation number may not begin with 0. Any number can be guessed in 7 tries or less. "Exist" column displays total number of digits you guessed right - "Cow", "Match" shows how many of those that exists were placed at the right spots - "Bull".

Play by entering your guess in the 4 boxes on the right side and click "Check" to validate your entry. You may also click "New" to start another game.

Have comments/suggestions? Send them to moo@bullscows.com.

01/22/07 By many requests I've created page that explains the way Ratings are being calculated.