bateleur and I recently played, and finished, the main game of
The Witness. It's a puzzle game that seems to be various series of panels to solve. This is mostly what it actually is, but the panels are carefully constructed and act as tutorials to each other. It's also rather beautiful to look at, although I did find that walking around in game gave me motion sickness.
I wrote a longer review: "
Beautiful, lonely setting to clever sequences of puzzles that look similar, but vary hugely and are tutorials in themselves" on GameFAQs.