A Killer Sudoku To Test The Best

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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 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

[MarkersDuh]

First attempt at a Killer Sudoku, and I did it in 1 hour and 3 mins! Pretty happy that I got it eventually, hopefully I'll be faster in the future. Thanks for the puzzle! :)

[Ptrr]

Thank you so much for introducing me to this incredible form of sudoku. As a cryptic crossword fan, I've taken a big sidestep into sudoku land because of the channel - and I love it!

[SimonNejmann]

You can tell right away (using the trick you use on the upper right and upper middle box) that the two cells sticking out of the bottom of the center left must sum to 14. (12+24+11+12 - 45 = 14). That means that they have to contain 59 or 68 - which would have been a huge help in your musings at 6:10 and forward, as you could have locked 8 in cell r7c7 and 6 in r7c9 right away.

[_Syrcx]

what a beast! took me around 90 minutes with some small breaks in-between!

[Wallopy_Joe]

Talking about quadruples around 11:00, but the 5 was far more simply not possible in the two parity cells because of the 5s in the 12 and 19 cages only sitting in c7 and c8

[jessejamesgames]

Crazy how you got the 1 in row six with only like 20 boxes left to fill and that was the 3rd number i found. cool to see these can be solved a few different ways.

[RandomBurfness]

Lovely puzzle! I liked the surprises, namely finding cages usually associated with not containing very small numbers actually containing kind of small numbers!

[robbbs]

Well that one was pretty ok, was able to solve it in under 20 min :D Nice puzzle & nice solve Simon!

[Sam_on_YouTube]

Just went back looking for an old puzzle. Solved this one in 57 minutes.

[pocoapoco]

Unless there’s a restriction that numbers can’t repeat within cages then you can’t start right away limiting the 4-cell 10 cage to 1-2-3-4 as it doesn’t lie entirely within one box.

[GEpicGaming]

Absolutely mind blowing how insanely good you are at sudoku.

[yiotatort]

I wish the app had a way to find out what numbers can go in certain boxes in killer sudoku, it seems like you've memorized them all, but for those of us with bad mental math, it would take way too long to figure out.


I enjoyed watching you solve it none the less.

[draconicdusk]

I never managed to spot the quadruple you mentioned. That busted the puzzle wide open and made it trivial. Well done.

[Loptr__]

Took me 24 Minutes. Took a slightly different route by noticing the Geometry in rows 6-8, concluding the left square in row 6 has to be 1 right to start with

[bakpaopuz]

Cell r6c1 was solvable from the start through geometry of the grid but I don't think it would've helped much towards the solve. As usual you beat me by a landslide, great solve

[yilunzhang]

Took me a long 49min to finish, but it was great! I got stuck at a couple places because it's not easy to see the combinations of the numbers in the cage.

[erickehr]

I think you confused yourself with your notation at some points. Why did you not use corner notation and centre notation like you do for normal sudoku? eg I think it would have helped you resolve the top right box a little quicker.

[vickyrheza]

been shouting for 8 in 26 cage the moment you put 89 pair

[Hugotgltz]

I did it in almost exactly 30 minutes, and could have been a bit quicker, but I struggled going back and forth between little and big numbers, lol. I don't think that is too bad

[peterbreis]

Fascinating to see what somebody misses because they are so concentrating on everything else.

Missed the 8/9 in the far right centre 24 cage for ages despite the 9 line up.