I am really a great fan of the Rovio games from Angry Birds and on. One of these games is the tricky puzzler Bad Piggies, which I have spent a great deal of time playing to unlock new levels (and as an illustration of deterministic simulation). Playing on my Nexus 7 I have solved level after level… and then I got myself a new Xperia phone. Not that playing on the go is that big an attraction, but if I happened to want to do that, starting over just felt wrong.