FourFour

Logic game.
You have to guess a four-digit number.
The less steps mean the higher result.

Rules:

All digits in the number are different.
After every attempt you will see the score, X:Y.
The first number, X, means an amount of guessed digits,
the second number, Y, means how many of them are in place.

The goal is to achieve a 4:4 score.