Talking of iOS, what would be a good game for my mother for her iPad. She hasn't played like one single game in her life. I tried Tetris out and it was just a pain to play since tapping = rotate so when you tap to swipe a piece in one direction it will also rotate meaning you can have your plan completely messed up at the last moment. Damn shame I missed that Ghost Trick sale.
Angry Birds is usually the gateway drug for non-gamers, but something less actiony and more thinky like Spelltower, Wordament or Where's My Water? might be more suitable. Otherwise Ridiculous Fishing.