Mastermind

Crack the 4-color code in 10 guesses. Colors can repeat. Guesses fill from the bottom up.

Show how many codes still fit after each guess

How to play

Click any hole in the highlighted row to select it, then pick a peg from the tray. Click a placed peg to remove it. When all four are filled, press Guess. Each new guess goes in the row above the last.

Keys: 1–6 pick a color, ← → move between holes, Backspace undoes, Enter guesses.

A black key peg means a right color in the right spot. A white key peg means a right color in the wrong spot. Key pegs aren't in any particular order.