http://www.tnelson.demon.co.uk/mastermind/ http://members.xoom.com/mastermind_only/mastermind.htm http://www.delphiforfun.org/Programs/MasterMind.htm http://www.maa.org/editorial/knot/Mastermind.html http://www.csc.ncsu.edu/degrees/undergrad/Reports/rtrosu/intro.htm http://www.math.niu.edu/~rusin/papers/uses-math/games/mastermind/mastermind