The Xbox One version has been reported to be “basically the same game” to the PS4/PC version, with “some technical differences.” Exclusive platform content has been dismissed by Blow.
Meanwhile, the iOS version is still in the works; it has been confirmed to contain lower-end graphics. There are also reports Blow’s company Thekla Inc. is “experimenting with tap-based movement rather than on-screen arrow keys: a single tap to walk, double tap to run, two-finger strafing, and so on.” Due to a combination of these factors and more, no release date for the iOS version exists.
Our review of The Witness by Joanna Nelius described it as a “beautiful, serene island” with “puzzles [that] transcend language itself. They pull you through a broad range of emotions – anguish, despair, desperation – but, once you finally solve that seemingly impossible puzzle, you can raise your fists in the air, victorious, and maybe taunt the game a little bit.”
You can check out the full review (which got an 8.9) of The Witness here.