Mastermind: Guess the Colors

Mastermind is a classic code-breaking game where a secret combination of 4 colors is hidden and you must deduce it in 8 or fewer attempts. After each guess, feedback pegs tell you how close you are: green for correct color and position, orange for correct color but wrong position.

Select a color from the palette at the bottom, then click a circle in the active row to place it. Fill all 4 circles in a row, then click 'Check Guess'. The feedback pegs on the right will show how many colors are correct and in the right position (green) versus correct color but wrong position (orange).

Green pegs (exact match) mean a color is in the correct position. Orange pegs (color match) mean a color is in the code but in a different position. Empty pegs mean the color is not in the secret code at all. Note that the order of feedback pegs does not correspond to the positions of the colors.

Yes, colors can be repeated. The secret code may contain the same color multiple times (e.g., red-red-blue-green is a valid code). This means you need to carefully track which colors appear once, twice, or not at all.

You have 8 attempts to guess the secret code. If you run out of attempts, the game reveals the hidden combination. Skilled players can often crack the code in 5-6 guesses using systematic elimination.

Yes. Mastermind is one of the best games for developing logical deduction and systematic reasoning. It trains hypothesis testing, pattern elimination, and working memory. It's widely used in education and cognitive training because it teaches structured problem-solving in an engaging way.