I imagine that my readers may be growing tired of my obsessions with various online games. Nevertheless, here is another one: Buttonmen, an online version of a Cheapass game. Unfortunately, I’m not quite convinced I’ve got the right kind of brain for it — I do enjoy playing but I feel that I’m not doing the game justice. Anyway, for mathematically-inclined people it’s a nice pastime, and one that doesn’t have to occupy many minutes of any given day.