Is anyone good at puzzles? The composition notebook that Elliot used as his journal has been published...inside are inserts with codes to decipher, etc.
One of the inserts is a page from Leo Tolstoy's book 'Resurrection'; which we see Mr. Robot reading in the show.
The assumption is the tictactoe grids are in some way a decipherable code leading to letters or words contained in the two Tolstoy book pages.
Here is the image of the two pages from the book. Pages 461-462. http://i.imgur.com/CWh56wA.png (The other inserted puzzles have been solved, but not the tictactoe puzzle.)
Just to provide more info-here are images of the notebook with inserts.
Front image of book and inserts. http://i.imgur.com/GBxwjxL.jpg
Back image of book and inserts. http://i.imgur.com/neHw6KJ.jpg
If you're good at such things and like puzzles - you might want to give it a look. I've looked at it and can't seem to find any sort of logical sequence to find words/letters using info in the grids. Again, it's an assumption that what is contained in the grids leads to deciphering a message from the Tolstoy book pages. Seems a logical assumption since the grids are written on the pages.
As a rule, these gimmicks outside of the show usually don't provide info that will make or break the show...just provides some background info usually. I keep trying to figure it out when I have time - thought someone here might like puzzles and the show and is willing to give it a try.