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Sudoku for Ninjas

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Here’s where you can try Assassin9 by Ore: https://app.crackingthecryptic.com/sudoku/ppTdQNN23n
1-9 appear in each row, column and marked region. Digits in a cage sum to the given number. Digits on an arrow sum to the number in the circle.

▶ SUDOKU PAD – Our New App ◀ NOW AVAILABLE – You can now input your own classic sudoku puzzles into our software using our new App! The app also comes with 12 handmade puzzles from us and it is NOW AVAILABLE at these links:
iOS: https://apps.apple.com/us/app/svens-sudokupad/id1570622073
Steam: https://store.steampowered.com/app/1706870/Svens_SudokuPad/
Android: https://play.google.com/store/apps/details?id=com.svencodes.sudokupad
On Amazon: Search for “SudokuPad”

▶ OUR PATREON PAGE – JOIN THE COMMUNITY, SUPPORT US AND TRY OUR PUZZLE HUNTS◀
https://www.patreon.com/crackingthecryptic

▶Our merchandise is all here: ◀
https://cracking-the-cryptic.creator-spring.com/

▶ CTC FAN DISCORD SERVER◀
https://discord.gg/BbN89j5

▶ OUR BACK CATALOGUE – ALL CATEGORISED WITH LINKS!◀
https://tinyurl.com/CTCCatalogue

▶ WHY NOT TRY OUR CLASSIC SUDOKU APP? ◀
AppStore: https://apps.apple.com/us/app/classic-sudoku/id1488838275?ls=1
Steam: https://store.steampowered.com/app/1188330/Classic_Sudoku/
Android: https://play.google.com/store/apps/details?id=com.StudioGoya.ClassicSudoku&hl=en_US

▶ OUR KILLER SUDOKU IS ALSO AVAILABLE◀
AppStore: https://apps.apple.com/us/app/killer-sudoku-ctc/id1544165118
Steam: https://store.steampowered.com/app/1471910/Killer_Sudoku/
Android: https://play.google.com/store/apps/details?id=com.StudioGoya.KillerSudoku&hl=en_US&gl=US

▶ YOU CAN ALSO TRY OUR SANDWICH SUDOKU APP ◀
AppStore: https://apps.apple.com/us/app/sandwich-sudoku/id1476116705?ls=1
Steam: https://store.steampowered.com/app/1117310/Sandwich_Sudoku/
Android: https://play.google.com/store/apps/details?id=com.StudioGoya.SandwichSudoku

▶ TRY OUR CHESS SUDOKU APP◀
AppStore: https://apps.apple.com/us/app/chess-sudoku/id1500654482?ls=1
Steam: https://store.steampowered.com/app/1250560/Chess_Sudoku/
Android: https://play.google.com/store/apps/details?id=com.StudioGoya.ChessSudoku&hl=en_US

▶ HERE’S WHERE YOU CAN TRY OUR MIRACLE SUDOKU APP◀
App Store: https://apps.apple.com/us/app/id1527363795
Steam: https://store.steampowered.com/app/1377260/Miracle_Sudoku/
Android: https://play.google.com/store/apps/details?id=com.StudioGoya.MiracleSudokuCTC

▶ THERMO SUDOKU is available too!◀
AppStore: https://apps.apple.com/us/app/thermo-sudoku/id1513994223
Android: https://play.google.com/store/apps/details?id=com.StudioGoya.ThermoSudoku
Steam: https://store.steampowered.com/app/1316390/Thermo_Sudoku/
Android: https://play.google.com/store/apps/details?id=com.StudioGoya.ThermoSudoku

▶ YOU CAN ALSO TRY OUR ARROW SUDOKU APP ◀ Here are the links:
App Store: https://apps.apple.com/us/app/arrow-sudoku/id1568407537
Steam: https://store.steampowered.com/app/1613680/Arrow_Sudoku/
Android: https://play.google.com/store/apps/details?id=com.StudioGoya.ArrowSudoku

▶SEND US PUZZLES TO SOLVE/CONTACT US◀
[email protected]
Snailmail: Mark Goodliffe, Box 102, 56 Gloucester Road, London SW7 4UB

▶FOLLOW US◀
Twitter: #crypticcracking
@crypticcracking
Instagram (for how to solve daily clues from The Times): https://www.instagram.com/crackingthecryptic/?hl=en

▶Music◀
Tim McCaskey (Guitar) or Lucy Audrin (Piano) or Riffclown plays Mozart’s Sonata no 16 (“Sonata Facile”)
▶SOFTWARE◀
Play the puzzle in the video by clicking the link under the video (above). Thanks to Sam Cappleman-Lynes and Sven Neumann for their work.
▶Logo Design◀
Melvyn Mainini

▶Opening Credits Design◀
Joel Blundell

▶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 twelve-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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29 Comments

  1. Mark, speaking of links and notifications. I never ssw the notice for THIS puzzle on the channel. I found this as a loose recommendation to one side.

  2. Maybe a slightly easier way to see that the orange blocks have to be 9:
    When deciding if the arrows in the middle of the puzzle can be 8/9: if you make them 8s then the only "blue block" that can be a 6 is R6C5 and that forces both R7C2 and either R7C5 or R7C6 to be a 1 leaving you with two 1s on row 7. (R7C2 may be able to be a 2 but that leaves you with two twos on row 7, anyhow)

  3. A great puzzle which took very long to solve but once the numbers started flowing it was such a joy!

  4. Smart puzzle, enjoyed this. Took me a while to get going, and I broke it for some reason I'll never know, but liked the way rows 5 and 6 worked. There was some easier logic than Mark used.

  5. That was monstrously hard for me. It took me almost an hour to find a break-in (extra region in r5-r6). And almost an hour more to finish… 1:51:57 for me.

  6. Spent about 45 minutes looking for a breakin and just couldn't find it. Such a joy to watch the solve now

  7. This was my longest solving time so far, but I was driven by the ambition to solve it without help. Still, I had to keep checking Mark's progress to make sure I was on the right track. My god… how fast and sure he is…. and how slow I am. A really great and exciting puzzle.

  8. Despite having a maths degree, I'm not a fan of doing maths based sudoku, much happier to watch you do the hard work for me! Thanks

  9. Even though I remembered solving Assassin8 on my own, I almost gave up on this one. It's rare a puzzle just feels impenetrable to me right from the start. I'm all the more pleased for having completed it in spite of those initial doubts. Once I figured out the logic behind the 9's it went relatively smoothly, and I was done in around 40 minutes.

  10. 38:10 for me. Quite a tough puzzle, it took me a long time to see the break-in and even after that it wasn’t easy to keep going. Very enjoyable as well, I liked it.

  11. I found the break-in (the circles in rows 6,7,8 must all be 9) sooner than Mark did, in terms of how much work was done beforehand. Yay, I get to feel smart!

  12. Amazing stuff Ore/Mark. Totally in my “gorgeous to watch but too hard to crack” category…! 😃

  13. A more straight forward deduction at 8:33 is to notice that you can't have a 7 (or more) on a three digit arrow, leaving just three of the blue cells capable of having 789. Which Mark noted at 10:17.

  14. Turns out that when it comes to basic sudoku, the only thing Mark is good at is spotting naked singles…

  15. I do enjoy your solves, Mark. I am amazed at the data you store in your mind while you are solving. I did take a look at this puzzle before watching your video, got about 1.5 deductions on my own, and then decided, "Hey, I think I'll have a nice relaxing evening and watch a brilliant person solve this." I was not disappointed. Thanks for this video. I will check out the stream a bit later, after the hockey game I'm watching on TV …

  16. 30:32 Logic here is convoluted. You had a 1 and 2 X-wing in rows 1 and 2, not just a 1 X-wing. Makes getting the 1-2 pair in R3C3 and R3C6 much easier… and by extension the 35 pair above them.

  17. 11:55 It’s not possible for the middle blue digit (R6C5) to be 6 because the rest of the arrow in R7 would be a 1-2 pair, and you’ve already allocated a 1 in R7C2 in this scenario. So orange has to be 9.

  18. @11:48, if R7C2 must be a 1, which it would be, you couldn't place 6 in R6C5 as it would need a 1/2 below it and the 1 prevents that.

  19. From the 11:18 point, there's an easier way onward …
    .
    .
    .
    … you already know the 6 blue cells that are on arrows are 1-6, which sum to 21. Meanwhile, the three cells in r7 that are on arrows (columns 2, 5, 6) sum to at least 6; thus, the total of the three arrows in that area sum to at least 27; thus, all three arrow totals are 9 (and r7c2, r7c5, and r7c6 are 1,2,3 in some order).

    [EDIT: Mark did see as much about 8 minutes later.]

  20. 23:13 "Let's get rid of the purple, we don't need purple any more" — HEY — GET RID OF THE ORANGE ALSO BECAUSE YOU DON"T NEED IT ANYMORE EITHER.

  21. 1:08:33 … it took me a long time to get going, and then I made an error that caused me to backtrack to spot my mistake. My time is nothing special; still, I'm happy to have found my way through.

    Nice puzzle!

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