First select which colors you want to play with. The default set contains six colors, like the classic game. For obvious reasons you are not allowed to play with fewer than two colors. Clicking on a tray in the box on the right will toggle the cover over it, indicating whether it will be part of the set the computer draws from. Then press Start button to begin.

Start filling the holes at the bottom row with pegs, and each time you have completed a guess ... i.e. filled all four holes and pressed the Guess button ... 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 10^th guess, the computer will reveal it to you and the game ends.

Lesson Plan from Becta in partnership with Naace (pdf)