The most complex sudoku ever?

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Cracking The Cryptic

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Published on November 21, 2019 8:15:01 PM ● Video Link: https://www.youtube.com/watch?v=i9hcI16LoN8

Duration: 34:28

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Buckle your chinstraps: this puzzle is complicated! And that's just the rules ...

Try it here, but make sure you understand all the rules, which follow: https://cracking-the-cryptic.web.app/sudoku/4nFtJMN9Df
Standard sudoku rules apply. Additionally there are four shaded tiles in each 3x3 square, which form a T, L, or S tetromino - each row/column of 3x3 squares has exactly one of each. Also the shaded squares form a valid Nurikabe, i.e. a single connected 'wall' which has no loops, and contains no 2x2 blocks of shaded cells. The shaded numbers in each 3x3 square all sum to 20, but no combination of shaded numbers is used twice.

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▶ABOUT US◀
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 eleven-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