The Hardest Sudoku Of Them All: Simon Vs Phistomefel Live

Simon attempted the new Phistomefel puzzle in a livestream. It’s fair to say this is one of the most extraordinary sudokus ever made.

You can find the puzzle here with an example of how it works:

https://logic-masters.de/Raetselportal/Raetsel/zeigen.php?id=0008A1

You can play the puzzle here:
https://app.crackingthecryptic.com/sudoku/fLtm97H9GD

Rules:
Every digit from 1 to 9 has to appear once in every row, column and region.
The regions first need to be determined. Every region is a set of nine orthogonally connected cells.
A digit in a circle indicates the number of borders between regions it sees in its row and column. Note that the edge of the grid does not count toward this total.
Remark: There is no negative constraint regarding the circle, i.e. there can be uncircled cells containing a digit that equals the number of edges seen in the respective row and column.

Patrons of the channel on Patreon can watch a video where Mark solves the example puzzle from the logic masters link above right now.

https://www.patreon.com/crackingthecryptic

** Our Patreon - The Best Sudoku Club In The World **
You can join us on Patreon for as little as $2/month and access a lot of extra content. Today Mark has added his solve of the example from Phistomefel’s new puzzle! This will give you an idea of what Simon will face tomorrow.

https://www.patreon.com/crackingthecryptic

▶ SUDOKU PAD - Our New App ◀
You can now input your own classic sudoku puzzles into our software using our new App! The app also comes with 12 handmade puzzles from us and we’re also releasing occasional bonus puzzles too. Get SudokuPad at these links:

iOS:
https://apps.apple.com/us/app/svens-sudokupad/id1570622073

Android:
https://play.google.com/store/apps/details?id=com.svencodes.sudokupad