I just got my girlfriend, who likes games a great deal but doesn't play many due to not having a good computer, to get Steam due to the winter sale. Problem is I don't know many games to gift to her or make her get. The problem is she's quite autistic, so reacts badly to a lot of things; excessively violent games make her react badly, and scary or disquieting games can give her pretty bad nightmare issues. She does however love puzzle games, which are perfect for her. Problem is while I like them too I don't know about many so need some suggestions, and thought I'd come here first.
I got her to get Braid, which so far has been perfect; her computer can run it, it's not exactly scary, etc. Limbo is too disquieting and weird, and Portal won't download on her computer (and I'm hoping GLaDOS wouldn't freak her out too much :P )
So, any suggestions for good puzzle games? The basic requirements are that they can't be very scary, and they can't be overly violent or gory (although I can't think of a puzzle game that is). If it's on sale, great, if not, it's good to keep on a list for if it does! Very much appreciate any and all help!