Very Tough Killer Sudoku: By Request!

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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

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I really like these videos where you solve harder puzzles. They are very educational for a newbie like me. I'm always amazed how people can solve these harder puzzles in such a "short" time :-)

jorgen_persson

Because of this video I tried a killer sudoku puzzle for the first time in my live. I solved a level 1 puzzle in 1 hour 30 minutes, with just one mistake. I loved to do it on this dailykillersudoku website. Thanks for introducing me to this puzzle world.

MightyKween

Just over 40 minutes for my solve. I wish I had noticed the 6-7-8-9 quadruple in row 2 that you did, would have made my deductions much easier during the first half. Most of my focus revolved around what the bottom right box could contain, as did your solve, and specifically how the pairs in boxes 6 and 8 restricted movement of particular numbers.

Pyromonkey

You can also observe that the 11 and 5 cages in the bottom row are 5 cells that add to 16, so must be 12346 in some order. Feels slightly easier than checking all the 11 combinations.

coolpapabell

This video is very good. Much details to help me to understand properly! Thanks to the video maker!

TianXi-xprb

Took me about an hour, bouncing back and forth between working on it and watching how you advanced. The main things I missed were the 8 cell restriction in the bottom left, and the 3/7 option in the top right, the latter of which is one I probably never would have spotted on my own. There were a number of things I approached a bit differently, but work better for me.

David-idjw

Got it right at 3rd attempt! I fully expected that the centre block would be the last to resolve, but in my solve I finished it 7th of 9!

olver

Took me about 33 mins to solve. I had a similar start but I had a different end getting stuck on a set of numbers not seeing the given 7 for a few minutes while I struggled. Great video and keep up the quality content.

SvviftDeath

Interesting watching you do it. I did it in 2hr 49m which is a long time. I started with the 33 cage and worked the bottom row and top right combinations. I dont notice the patterns so use trial and error.

LearnSciSnippets

This was the first level 9 puzzle I was able to solve on my own!

JasonMDockins

Anybody else screaming at the screen when he leaves the 45 pair in r8c9 with the 4 in r8c1 at 16:03?

krisjaniswhittaker-lee

Good one, I struggled, but you spotted a few things quickly that I missed early on.

kevgermany

This took me 40 mins, Quite a few hidden tripples here. Really fun puzzle!

draconicdusk

I did pretty much the same things you did. It just took me twice as long.

jimdetry

Great puzzle! Unfortunately I got stuck where you determined that R3C7 was not a 3 because I did not spot the logic with the two 11 cages (regrettably). I actually bifurcated that cage as a seven and it worked out so I ended up still following a very similar path

matthewdonelson