A Sequel and A Tribute!

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Puzzle # 19: XV(-) Quadruple Sudoku!


Hello again! This XV(-) Quadruple Sudoku! is a natural and somewhat trickier sequel puzzle after one of my earlier blog puzzles - an XV Quadruple Sudoku (no negative constraint) - was solved by SudoKanard on his YouTube channel. If you haven't heard of him, please do yourself a favour and check out his channel (https://www.youtube.com/channel/UCHX1SYeqduyWWSYG7K7sFGA) and blog (https://sudokanard.blogspot.com/) - his videos are always very enjoyable and he solves all manner of sudokus and puzzles so there's something for everyone!


Back to the task at hand now! I must say the negative constraint in an XV Sudoku lends itself to some nice logic but is trickier to use than a puzzle without it, so I hope you enjoy this slightly tougher but still pretty manageable puzzle :)


Oh, you're wondering about the maths in the title? Well, the answer to that one will surely come on a YouTube channel in the not too distant future ... shouldn't be too hard to work out which one ;) :)


Rules:

- Apply classic sudoku rules

- Digits surrounding a white circle must contain 1 of the 4 digits surrounding the circle.

- Digits separated by an X or V must sum to 10 or 5 respectively.

- Digits NOT separated by an X or V must NOT sum to 10 or 5 respectively.



https://tinyurl.com/27r5pjb8


Enjoy, and may the cookies crumble in your favour!


CC :)


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