Bulls & Cows

Try to guess the computer?s four-digit number. After each guess, the computer will give you Bulls (or black marks), signifying correct digits in the correct positions, and Cows (or white marks) signifying correct digits but in the wrong position. Try to get it in the fewest number of moves. Then, switch roles and let the computer try to guess your number. The computer plays a pretty good game, but can be beaten with a little effort!