8ch's /v/ was specifically working on a wiki for game recommendations. This hasn't been getting as much support as it should, but it is the only thing I know of that is like what you were describing. Something like this for what you're asking is probably the best way to go.
There's a mod for TF2 called Team Fortress 2 Classic that, kind of obviously, makes it much more like Team Fortress Classic. I think it's great, and it's pretty simple to install. http://tf2classic.com/
I wouldn't be too excited about finding time for The Witness. I've heard it's just repetitive maze puzzles, but also has inconsistent mechanics which become frustrating. Fortunately Steam has it's refund system now.