Bulls and Cows Puzzle is a classic puzzle game developed by Pavel Ilyin, available for free on Android. The game is based on the popular Mastermind puzzle game, where the player has to guess a four-digit number that the computer has randomly generated.

To play, the player has to guess the four numbers in the correct order, and the computer will provide feedback on each guess. If a number is correct and in the correct position, it will be represented by a 'bull', while if a number is correct but in the wrong position, it will be represented by a 'cow'. The game continues until the player guesses the correct number in the correct order.

Bulls and Cows Puzzle is a great game for puzzle lovers who enjoy a challenge. With simple rules and easy-to-use controls, it's a perfect game to play during your free time and test your logical skills.