alright... so I found this easier this time and, counting my time it took me about 15 minutes to solve. Very concentrated and with good music on (not saying that game music is bad its just that hearing a wide variety of music helps me concentrated and open up more)
So in a nutshell, you want to get 7,8 and 6 from left to right, into that order in the bottom, the last row. Once you do that, (can be done intuitively so you move everything around) do not! touch it.
Then, fiddle around with the top two rows. I think there is a specific sequence of moves, like pan the numbers of any row to the left and right first so that the empty is in the middle, then sliding the middle number up or down. Then sort of rotate that. I think its stuff like move the empty to the right, then up, then left then down, then separate number again and so on, The idea is of course to get 1,2, 3, then 4 5. and the empty space to the right of 5. Once that is done, slide the 6 up and you are totally done. I think the trickier part is that one, but its definitely doable. I will detail and edit this post if I find more details or strategies, but essentially everything seems to revolve around that middle row, 4, 5, and 6.
Edit: 15 hours later and a few more tries when I am more awake.
seems like when you get 7, 8 and 6 all set there is a rather interesting series of moves that require you to actually rotate the numbers of the two tops rows but only part way, then switch them until you get a specific, desired order. SO you might rotate the entire figure or the entire series, say, clockwise until you get the empty space in between two (hopefully) consecutive numbers (in the middle is honestly easier to grasp and manipulate, so its like you leave the empty space to one side) and then once you get the empty space in the middle comes your opportunity to do just one change. It will affect the order of your numbers so you can then make the number switch sides. You must decide whether the space ends up on the left or to the right of the row since that influences it all. Once you do that, you must rotate the figure again, clockwise or counter clockwise, until the space is in the middle again, and so on. If you go into a clockwise direction your numbers must read like so: 1, 2, 3, empty, 5, 4. If the number one is on the exact middle of the entire 9 by 9 grid, then you go to the left and then up and right, and you get that order, you are on your best and most correct path to solving so its pretty easy from there. You just rotate the whole thing
So 3 which is in the top left corner moves right, then two moves up, then you backtrack to the middle because number one has not moved and move it left, and so you end up with:
empty in the whole middle of the grid, move left and find one, then up and find two, then 3 is directly above the empty space. then five should be to the right of the number 3 (top right corner), and then 4 should be right to the empty space, below 5. SO its like you put the ones below sort of where you would want them to go.
So at this point you just backtrack again! and move things from the other side of the grid. do not touch your 1, 2 or 3 yet... they are fine where they are for now. and instead move 4 to the left and 5, who is still in the upper right corner moves down. That should leave you with the space in the upper right corner so you slide 3 into it, then 2, and then one moves up. You then make the horizontal move.. since you are left with empty, 4 and 5 (from left to right) in the middle row. You move both 4, then 5 to the left then you can just slide six (who is on bottom right corner) up, and that's it. you are done.
I promise to mold this into a much better explanation hopefully soon. I am fun beating the game now! it takes me a bit less each time.
Let me know how you do with this partial strategy!