The Witness
This is a game that will you throw you into the deep end, explore and learn or you will sink.
On the surface the game looks simple and 2 dimensional but the puzzles require thinking outside the box, learning the rules of the puzzles and some have to be solved in a various, sometimes ingenious, amount of ways.
The graphics are stunning and the world absorbing. The puzzles are just hard enough to not frustrate too much but satisfying to solve. If you are prepared to scratch beneath the surface, you will fall in love with this game. 9 out of 10