You can try today's puzzle which first appeared as a New York Times "Hard" Sudoku on 27 August 2019 here:

https://crackingthecryptic.web.app/...

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We sometimes use Duncan's Sudoku Solver, which is available at http://www.littlegogs.com/index.shtml
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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 eleventime 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