When it comes to mobile games, Zap Apple Buckin' is as basic as you can get: apples appear on the screen, and you have to touch all of them before the time runs out. To be honest I barely even consider this to be pony related, so I'm not including this on the Arcade, but if you're really bored and have an Android phone then this might be okay for wasting several minutes of your time. There's also a Flash version, although I don't really see the point of it either.
...Meanwhile, I might have something more interesting to post today, if Wishdream manages to finish his trailer on time.