The Witness is a game about a single puzzle type, but it uses the environment, sounds and all sorts of objects to alter the puzzles. All while leaving hints at why you are in the world, but it’s very subtle. I have played this games hands on and really enjoyed my experience, even though it was sometimes unfair.
I have analysed this game to figure out what makes what works. I realised that it uses one mechanic over and over again, but it squeezes every single use it could out of it before continuing.