This World-Class Sudoku Has Just One Given Digit!

You can try this sublime puzzle by Christoph Seeliger here:
https://cracking-the-cryptic.web.app/sudoku/g7q2mFfLp7

Colourblind version: https://cracking-the-cryptic.web.app/sudoku/N7mQjb6RHq

Note: There is a really simple and clever trick (which I fail to spot in the video) that can help solve this sudoku... can you see it?! [I am feeling very sore from the amount of kicking myself I've had to do...]

Prasanna Seshadri's 14-variant sudoku can be played here:
https://www.patreon.com/posts/37065725

Pleiades Slitherlink extravaganza:
https://twitter.com/pleiades_puz/status/1259453136260886531

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Hi! We're Simon Anthony and Mark Goodliffe, two of the UK's most enthusiastic puzzle solvers. We have both represented the UK at the World Sudoku Championships and the World Puzzle Championships. We're also "cryptic crossword" aficionados. Mark is the twelve-time winner of The Times championship and Simon is the former record holder for most consecutive correct solutions to The Listener crossword. We hope we can help your puzzle solving while also introducing you to some of the world's best puzzles.

Thank you for watching!
Simon and Mark

Видео This World-Class Sudoku Has Just One Given Digit! канала Cracking The Cryptic