I think an experience I had playing this game is a testament to how good it is.

I was waiting for a couple friends to come round, but had an hour or so to kill, so I sat down to play a bit more of The Witness, a puzzle game I'd picked up the day before. When they arrived I said "I'll just finish this puzzle". Before I knew it we were all entranced in this game for the next few hours, addictively going from puzzle to puzzle, exploring this vibrant colourful, masterfully laid out island.
Both friends ended up buying & completing the game themselves. If you like puzzles/brainteasers then The Witness is an incredible game to pick up, especially if you want a break from the usual genres.