According to Wikipedia, Nim is a two-player mathematical game of strategy in which players take turns removing objects from distinct heaps. On each turn, a player must remove at least one but as many as all objects, provided they all come from the same heap. In ancient times it was played with piles of sticks and whoever picked up the last one was the loser, though nowadays it's common to switch that so the last play wins (Mind Nimmer takes the latter approach). So how do you dress up such a simple puzzle game for the iPhone? Grataware LLC certainly gives us one possibility with Mind Nimmer.