ColorCode is a free advanced MasterMind clone with lots of different game variants, from the very easy up to really challenging ones. You can combine any color count from 2-10 with any column count from 2-5 and allow or not pegs of the same color. Or you may select one of the 5 predefined levels of difficulty. ColorCode has also a rather intelligent built-in MasterMind solver. WWW: http://colorcode.laebisch.com/