I played a few hours of The Witness today and it was amazing. This is definitely a game that some people will love and many others will hate, but I'm strongly in the "love" camp. I don't review a lot of games (the last one was Bloodborne last April), but expect to see more on this game on the site in the coming days. It's just...wow.
Fair warning, people are pretty serious about spoilers for this game, so keep that in mind as you scroll down.
First up, here's a clip of some puzzle solving from the first 10-15 minutes of the game.