[kshahkshah]

I play Mastermind with my kids. It hasn’t clicked quite yet with them but I’ve shown them my strategy of eliminating colors by making an entire row a single color successively. Either it’s not present or now you know how many of a particular color. Then you just need to figure out ordering. Again you can use a known “bad” color to avoid ambiguity of multiple white pegs

[apaprocki]

Similarly, I explained to someone how to systematically solve it like this, but then when I suggested they now apply it in a new game, I chose all the same color for the code and watched them second guess themselves until all guesses were exhausted. They just couldn’t accept the possibility that the code could simply be all the same color. Was a good opportunity to quote Sherlock Holmes.