Sudoku Secrets No. 1: The Phistomefel Ring #shorts

In response to viewer suggestions, we're planning to make a series of YouTube Shorts (videos less than 1minute long) where we explain some of the secrets of sudoku.

This edition looks at The Phistomefel Ring. You can find a video where the Phistomefel Ring is important here:

https://www.youtube.com/watch?v=ZLcey7qiXv8

Видео Sudoku Secrets No. 1: The Phistomefel Ring #shorts канала Cracking The Cryptic