The Phistomefel Ring Is Divisible by 10x9x8x7x6x5x4x3x2x1

** TODAY'S PUZZLE **
A new setter bfranj17 has come up with this extraordinary puzzle involving the Phistomefel Ring and factorials! This is a really remarkable sudoku with some fascinating logic hidden inside it. We have no real idea how difficult it is - it felt quite challenging... but awesome.

Play the puzzle at the following link:

https://sudokupad.app/QBmD43GFg3

Rules:
Normal sudoku rules apply. Digits along an arrow must sum to the digit in that arrow's circle. Digits along a thermometer must increase from the bulb end. Adjacent digits along a green line must differ in value by at least 5. Cells separated by a white dot must contain consecutive digits. The product of the digits in the 16-cell "picture frame" surrounding the central 3x3 box (sometimes called the "Phistomefel Ring") must be divisible by 10! (ie 10x9x8x7x6x5x4x3x2x1).

** HEXCELLS STREAM **
We're streaming more Hexcells tonight at 10pm UK time:
https://youtube.com/live/UGb0KneGqBQ?...

You can watch our recent Hexcells Plus stream here:
https://youtube.com/live/EmtGnpXF0lw

** ROLLER COASTER NURIKABE by the_cogito **

Simon's 2.5 hour solve of Roller Coaster Nurikabe by the_cogito is now available on Patreon. Check the puzzle out at the link below:

https://logic-masters.de/Raetselporta...

Also there's our January Patreon competition: All The Fun Of The Fair featuring sudokus themed around fairground rides!

Join us on Patreon (for as little as $2):

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** KICKSTARTER - DELIVERED 24 December 2023 **
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https://www.kickstarter.com/projects/...

** ORDER OUR NEW BOOK AT THIS LINK **

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▶ SUDOKU PAD - Use Our Software For Your Puzzles ◀

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

Steam: https://store.steampowered.com/app/17...
Android:

https://play.google.com/store/apps/de...

ALSO on Amazon: Search for “SudokuPad”

▶ Contents Of This Video ◀

0:00 Theme music & Puzzle intro
1:10 More book arrivals
1:31 Riffclown's Incoming Sudoku Hunt TOMORROW
2:07 Hexcells stream TONIGHT
4:41 Happy Birthdays
3:38 Rules
6:10 Start of Solve: Let's Get Cracking
9:43 End of Phistomefel Theorem Proof

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Simon Anthony & Mark Goodliffe
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