Mastermind

Your goal in this game is to find out the color and order of the 4 hidden balls. After each guess you made the game shows up either a black or white "spike".
White spike means: you guessed the correct color of one ball, but failed to gess its order.
Black spike means: you guessed both the color and the order of the ball correctly.
Spikes doesn't show which ball you guessed, you have to find that out based on the answers the game gives you.
You can use the following colors in the game: red, white, blue, pink, orange, purple, yellow, green. The balls can be identical color, even all four. This game is a digital version of the well-known board game Mastermind.