You have 12 attempts to arrange four colours in the correct order. Colours can be repeated and are entered as 4 letters. Example: RGGB. When you enter a pattern, symbols will pop up. ● means you have a correct colour in the correct position. ○ means you have a correct colour in an incorrect position. So ●○ would mean you have 1 colour in a correct position, 1 colour in an incorrect position, and 2 incorrect colours.