Great interface

You CAN unlock the 4-peg level for free by winning enough 3-peg games, which isnt that hard. The interface is great - easy to choose colors, easy to rearrange pegs, several clever shortcuts, and you can lock down pegs when youve solved parts of tricky puzzles. The apps solving algorithm is fairly straightforward, but not overwhelmingly effective - easy to learn by just watching it, and you can run up a high, 1000+ rating if youre good at using a more effective strategy. I love this game!

RTnHNL about Ultimate Mastermind