A logic game where you have to open a virtual safe by choosing the right code combination. Every 4 times you press the button, the numbers you enter will be highlighted in a specific color.
If the color is gray, then this number is not in the code.
If the color is yellow, this number is in the code, but it is under a different number.
If the color is green, the number is guessed correctly.
If the color is blue, the number is guessed correctly, but somewhere in the combination there is another such number.