The Witness is an open world puzzle and exploration game that feels somewhat like an updated version of Myst. You awake on an island that's seemingly been abandoned, with all manner of unusual devices strewn about. Logic is vital to progression, as entire sections of the island are locked away until you can solve the puzzling nature of the devices.
The early areas of this game are right up there with Portal in terms of teaching the player, which is no small feat considering it uses no dialogue to do so! The difficulty spikes a bit later on, especially if your exploration takes you to an entirely different part of the island! Overall, The Witness seems like an interesting title that puzzle-solvers should be fairly entertained with. You can hear more of my thoughts on the game at 4:25:58 in the video above.