This puzzle by new setter Martin Regan has a 98% approval rating on Logic Masters Germany! Try it here:

https://cracking-the-cryptic.web.app/sudoku/m9mRgtN2jh

The Miracle Sudoku video is available here:

Our Celebration of 150k subscribers video is here:

▶ *NEW* CRACKING THE CRYPTIC MERCHANDISE◀

https://teespring.com/stores/cracking-the-cryptics-store

▶ THE FIRST SUDOKU PUZZLE HUNT BY BEN NEEDHAM◀

https://www.patreon.com/posts/36694746

▶ OUR CHESS SUDOKU APP IS NOW OUT!◀

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

▶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

▶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

▶SUPPORT US + ACCESS EXCLUSIVE “CRACKING THE CRYPTIC” PUZZLES/VIDEOS◀

Patreon: https://www.patreon.com/crackingthecryptic

▶SEND US PUZZLES TO SOLVE/CONTACT US◀

[email protected]

▶FOLLOW US◀

Twitter: #crypticcracking

@crypticcracking

Instagram (for how to solve daily clues from The Times): https://www.instagram.com/crackingthecryptic/?hl=en

▶SOFTWARE◀

Play the puzzle in the video by clicking the link under the video (above). We are building a website which will allow you to enter your own sudoku puzzles into the software and this is coming soon!

▶Logo Design◀

Melvyn Mainini

▶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

source

12:15 the outies in >32cannot be two cell because there is already a 1 in the box so r5c3 has to be green.

Hints:

2 and 3 are the sandwich “crusts”

column 2 total: 0

column 5 total: 26

column 7 total: 0

column 8 total: 13

row 3 total: 4

row 4 total: 12

7 can’t be in any of the tetrominoes

The tetromino that has different digits than the others’ digits in numerical order are 2348

Don’t forget column 9!

Took me about 1hr20m to finish but with one quick check to see if I'd gotten the 2nd crust right (was off by one so went back and found the proper logic for it). One of the harder ones I've (almost) done myself, so I'm happy 🙂

I'm glad you clarified the rules beyond the written part, because it was

notclear to me that A and B had to be the same digits for all sandwiches and I was like: "How are you even supposed to tackle this?!?"I found that 3 was across the sandwich using the tetris shapes.

So, this one took me a good 52 minutes. Now, comparing what you did… I got all my 4-8-6 mixed up compared to your end result, yet the validation says that "looks good". Is it possible that this sudoku has more than one solution?

Curious to see if he sees the "1" clue, forcing the sandwich numbers…

Thanks for showing this, was enjoyable watching it being solved

!

It was also educational, as, for my first puzzle, it showed I'd over erred on the side of caution, and meant – as some comments have correctly pointed out – that it could be solved without some of the clues and/or constraints.

The plan was to allow one crust to be deduced from initial clues, and then the second crust disambiguated once the clones had been identified

For those interested, the path I had in mind was

10:43 – 13 can't be 4 cells if 2+3/4 are in the crusts (as min 1,3,5,6 >13) , so last

threerows are green in C6.With 12/6 sandwich clues on last two rows, means the two crusts must be on a diagonal in box 8

The 6 clue means it can never reach the edge, so C9R9 is also green,

Then at 12:50 you can see the 11 clue must be upward and must be

exactly2 cells– can't make 11 as 1 is below and if either 3/4 is a crust (min 3,5,6>11)

That fixes the crust to be in C9R2

The 12 clue can't contain a 1, so 1 must be in the straight tetris shape

The two given 1's means there is a 1 in the skew shape, so the straight/skew are the clones.

As the given 7 is not in either the straight or T, this must be the digit that is missing from both sets

2 is also not in the straight shape, so must be in the T shape, making it have a 1 outside, and the other crust is 3.

and the rest follows.

why do you never seem to link to the source of the puzzles?

Its been 5 days since this video was released and I am still waiting for Simon to finish coloring the grid.

A second puzzle of Simon’s in a row that I completed faster than him! Thank you Simon and Mark for this channel.

I took 25:57, What a wonderful puzzle. Finding the breads is the most important, but I could reduce only 2 cases from the starting point.

Finished it in 2 hours, with 2 or 3 restarts due to a misunderstanding of the rules.

Got this one in 45:46, without watching any of the video (besides the rules). Very fun puzzle, honestly I went in not expecting to be able to get it but the 39 clue really narrows down the options and once you figure out the sandwich "toasts" as you say, it's relatively easy.

I'm actually not sure what one of these rules means, and a clarification would be helpful:

Let's say I determine that the doubled set of tetris digits is 4567. Does that mean that

noneof the digits in the third shape are 4, 5, 6, or 7, or thatat least oneof them is not a 4, 5, 6, or 7?I haven't watched the video through yet, only up to "let's get cracking", and I am not any more clear on what the rule means.

EDIT: Never mind, rewatched the part where he describes the rule and he uses the phrase "entirely different". Solved it under the assumption that none of the digits can repeat, which was the right one.

Doesn't finish colouring in the grid. My eyelid starts twitching. I shall not sleep tonight.

It might be good to switch the "Main Video" at your home page

( https://www.youtube.com/channel/UCC-UOdK8-mIjxBQm_ot1T-Q/featured )

from the 5-month old video about the "new" Sudoku App to either "The Miracle Sudoku" or "Our Astonishing Viewers".

anyone else here after james charles’s vid?

'This is absolutely stunning'.

I can't really explain my logic but I just kind of decided it's 4 and 2. Soon enough I did encounter impossible situation tho, so I came looking for confirmation here and saw I was wrong from the start. Gladly that didn't really change other logic I had puzzled so I could still get quite a fresh start and finish the whole thing. Nice puzzle, different from normal sandwich sudokus!

Great, now I'm hungry AND still don't know how to solve these

The rules state – "…sandwiched between digits A and B". And not "…sandwiched between digits A and B(C) or (C)A and B (or some variant thereof). Very confusing. Sandwiches are hard enough. Having to deduce the "crusts" raises the level. Having 2 crusts become 3 digits, well that just went right over my head. Kudos to all of you who were able to deduce and move past that.

A little bit slower to spot things today, don't you think? Or is it just me? I usually don't get frustrated by it but now for some reason it did

I did it! Took me just over an hour, but considering I went into it thinking "There's no way I can figure this out," I'm pretty well pleased. 🙂 There was a point where the blue shapes disambiguated the 12 clue and couldn't help but yell at my boyfriend across the room "Oh my god, this is GENIUS," and I'd like to believe Simon's spirit took hold of me for a moment. 😉

Now to watch the professional do it far more elegantly. <3

I resolved the 3/4 question using the 6, 12, and 13 clues.

Starting from the same place as 14:38…

– r6c6 is a crust, and there must be one more crust in c5

– So c5 must have a second crust in either r8 or r9

So in that 2×2 grid in the bottom-middle box, we already know there's a crust on the left (c4) and one on the right (c5).

– The left & right crusts can't be next to each other, because of the 6 and 12 clues… So there's only two diagonal layouts of crusts there

If the 2 is in the bottom-left (r9c4)

– The crust numbers are 2&4

– The 6 clue must be a 1-5 pair

– The 13 can't be 1-5-7 anymore, so it must be a 1-3-9 triple

– Now the 12 clue is broken: it must be two digits, but it can't be 4-8 (crust) or 5-7 (the 5 in c2), so it had to be a 9-3 pair, but the 13 clue needs both the 9 and the 3

So the left crust (c4) must be in r8, leaving us with a 1 in r9, which means the crusts are 2-3.

COLOR THE BOARD IN WTF

"And now we're gonna cook with gas."

I love it.:DDDDD

I just solved half of it thinking A and B was definitely 2 and 4, then I realized I was dumb

I went exactly wrong here 18:28, I failed to see that this breaks the puzzle!

At least the first thing I spotted was the 1 clue at the third row from the bottom, I got cracking a fair bit and then suddenly is stuck.

I’m disambiguating the puzzles with trial and error! Coz I’m failing to recognise the logical progression 😭 but am having fun though!! 👍🏼

30:51. I never hopped to get that close to your minute count!

Combining the 39 clue and 1 clue to figure out that (A,B) could only be (2,3) or (2,4) was easy enough, but I found the puzzle relentlessly difficult afterwards.

A bit like Simon in the video solve, I thought that those two possibilites would be disambiguated soon enough, and got slightly frustrated when I kept running into long chains without doing so… I was much slower to discover the contradiction that eventually blew the puzzle open. Found the latter part of the solve really enjoyable, and eventually solved in 42:25.

Great puzzle

1hr 54 mins. What is even life.

Every time I try (and usually fail) one of the puzzles on this channel I'm astounded by the craft that goes into these puzzles. I can't imagine creating a challenge like this.

Fun Sudoku, but I can't actually remember using the tetris shape clue when doing it. Seems like a complicated restriction that didn't get much use.

Holy crap! I finally got one of these crazy puzzles without any help. Granted, it took 1:23 versus Simon's 23 minutes, but I feel pretty good.

I've solved it in a different way than Simon did. Deducing second crust as 3 from first column by forcing 456 triple into a sandwich of 15. It was possible after eliminating any other triple. After that I was able to finish the whole puzzle WITHOUT using tetris restriction clue. It simply filled out correctly into tetris blocks. I wonder whether tetris restriction is even necessary.

3/5 difficulty? Seems at least 3.2 to me…