Spore for iPad

I know this is late, but for iPads and iPad minis you should check out Samsara (Natural Selection). It's a natural selection simulation that is sorta kinda like Spore but with a much simpler array of animals. The interesting thing about Samsara is that the evolutionary rules and natural selection are not entirely obvious, so you have to watch what happens and develop them for yourself. If you have students who are inquisitive and willing to invest some time, it can be a useful learning tool.