It's been in my library for years and I didn't know much about it. Randomly started playing it a few days ago and I've been having a blast solving the puzzles. It's been a while since a game has really made me want to finish it and see what is at the ending.
I'm at the end now working on the final (I think) puzzle.
If you end up enjoying the Witness I wholeheartedly recommend the parody of it, the Looker. It's the kind of parody that can only have been made by someone who really loved the original, because it has genuinely good and clever versions of the mechanics, and it's also free
Gotta disagree with you here. The Witness is a piece of art. The Looker is a cheap parody at best, which pokes fun at The Witness while completely failing to recognise what made it great.
Well each to their own, of course! I personally thought that the Looker managed to really effectively capture that same way of wordlessly teaching mechanics and encouraging you to push at the boundaries of those mechanics, which is what made the Witness great for me. It does poke a lot of fun at things in the Witness like the slow animations and the philosophical audiologs, but much of that poking fun only makes sense if you honestly engaged with at least a good chunk of the original stuff in the Witness in the first place. There's definitely not as much to the Looker as there is to the Witness, but, well, it's a parody. That's to be expected. I see it as a fun and more light-hearted expansion to be played afterwards, not a competitor or replacement.
I second 'The Witness'. Its a great game and the puzzles get very interesting as you progress and begin to understand the world you have been thrown into.