"Octopus Rules Apply"!!!

*** TODAY'S PUZZLE ***
[Simon recorded this video on his laptop and we're aware that the video quality drops in the last 15 minutes. Apologies. It would have been awful to have to junk it given the quality of the puzzle. Things should be back to normal tomorrow.]

Happy Birthday ThePedallingPianist - who returns to the channel with an absolutely extraordinary sudoku tonight called Killer Octopus. It is absolutely remarkable that this has a unique solution and the logic is extremely original. He shouldn't really be giving us presents on his birthday but it seems he has!

Play the puzzle at the link below:
https://sudokupad.app/d7siz7tehr

Or with added Octopus graphics:
https://app.crackingthecryptic.com/seisxtsh0f

Rules:
Normal sudoku rules apply. Digits in a cage must sum to the given total. Octopus rules apply. I.e. draw 4 lines that must each: i) not cross or overlap anywhere except r5c5, where they all intersect; ii) have 180-degree rotational symmetry around r5c5; iii) visit exactly 2 cells on the edge of the grid, which are the beginning and end of the line; and iv) all be the same length (in number of cells passed through). The 4 lines are "Same Difference" lines. I.e pairs of adjacent digits on a line must all have the same difference, though this difference may be different for different lines.

*** NEW SANDRA & NALA FOG PACK ***
A bonus sudoku pack was released on Patreon this week of 5 fog of war sudokus to celebrate the arrival of spring (in the Northern hemisphere) from Sandra & Nala. It's completely free - just click our Patreon link below.

Other treats on Patreon include:
- the new James Bond sudoku hunt competition;
- Simon's latest forays into the world of Islands Of Insight;
- Mark's video looking at the new OneUp puzzle from Rodolfo Kurchan;
- his solve of Region Geometry by Emre Kolotoğlu (3hr 36min long...!);
- and Mark's latest solve of The Times Club Monthly cryptic crossword

https://www.patreon.com/crackingthecryptic

*** GE..