Donaldson R F Code Breaker
Guess the secret 4-colour code. After each guess, a black peg means right colour in the right spot; a white peg means right colour, wrong spot.
Build a guess, then press Submit.
Classic rules: the code is 4 pegs long, chosen from the colours above. You have 10 guesses. This version lets you choose whether the secret code can repeat a colour.