I've decided that I'm going to be buying my younger brother some Steam/GOG games for Christmas. He's a HUGE fan of the exploration-puzzle-adventure-obtuseness simulator Myst, and he bought a high-ish end gaming PC recently to play the recent Kickstarted game by the same developers. So now that he has something he can play games on I'd like to get him some more games along those rough lines. I'm thinking The Talos Principle would be a good one, and I'm going to slip in a copy of Danganronpa because he could use a good traumatizin' (and I think he would enjoy it), but puzzle games aren't exactly my genre so I might be overlooking some good ones.
Anybody got ideas? Cheaper is preferable so I can get him more games in case he doesn't like some of them, but I'm open to all suggestions. No or minimal action is preferred.