1)   Cows and Bulls for PALM 3.3 The objective is to correctly guess the 4 digits number generated by the computer. A bull means that you have guessed a digit and it is in the correct position. A cow means that you have guessed a digit but it is in the wrong position. 2)   Cows and Bulls for Windows 3.0 The objective is to correctly guess the 4 digits number generated by the computer. A bull means that you have guessed a digit and it is in the correct position. A cow means that you have guessed a digit but it is in the wrong position. 3)   Cows and Bulls for Pocket PC 3.0 The objective is to correctly guess the 4 digits number generated by the computer. A bull means that you have guessed a digit and it is in the correct position. A cow means that you have guessed a digit but it is in the wrong position.