Talos Principle is a really underrated game IMO. It should be up there with Portal as one of those genre defining moments in gaming.

It has a nice relaxing atmosphere as well; something not a lot of games manage. No gritty military facilities or anything flashy and overly distracting, just grass-covered medieval/Roman/Egyptian ruins outside in the sun.

Just take your time and figure the puzzle out — the game doesn't get in your way.

I remember for about a week after playing it, when I got in the elevator at work I half expected the narrator to start talking.