In a statement on IGN, Jonathan Blow announced, that The Witness will come to Xbox One on September 13th 2016. Thekla is also continuing to work on an iOS version of the game, which will be the same game with the same puzzles, just with lower-end graphics.
The Witness has over 500 puzzles and was first released on Playstation 4 in 2013.
Source: www.ign.com
