The object of this game is to guess the sequence of four colored pegs the computer
has selected at random from the circled colors in the right field.

You start filling the holes at the bottom row with pegs, and each time you have
completed a guess (i.e. filled all four holes) the computer will respond by giving
you one peg for each correct color - black if your guess was also in the right place,
otherwise white. (But you will not be informed about which colors were correct.
That part you will have to figure out for yourself.)

If you haven't managed to guess the sequence by your 8th guess, the computer
will reveal it to you and the game ends.

First select which colors you want to play with. (The default set contains blue,
green, red and yellow. That's moderately difficult. For obvious reasons you are not
allowed to select fewer than two. :-) Clicking on a color in the field on the right will
toggle the circle around it on/off, indicating whether it will be part of the set the
computer draws from. Then press 'Start' to begin.

In case you wish to start over, just press 'End' to discontinue the game.

Disclaimer: the name "Mastermind", the toy and distinctive likenesses thereof are the properties of Hasbro Inc. This applet is an unofficial, not-for-profit version and neither it nor this site is endorsed by Hasbro in any way.