Guess Number by Matteo de Virgilio

Guess Number is a game where you must use your logic in order to guess a 4-digit (EASY), 6-digit (MEDIUM) or 9-digit (HARD) secret number selected by the computer at the beginning of the game. The number is formed with digits from 0 to 9; each digit appears once at most. This number is guessed by you via multiple attempts. An attempt consists in a proposed numbers, selected by you, and the computer's reply. The computer must tell you, in his reply, how many digits have you guessed on the same position and how many digits have you guessed in the new round. Using information from the computer's reply, you must guess the number using as few moves as possible.