How To Crack The Sudoku Code

** TODAY'S PUZZLE **
Marty Sears is a sudoku-making machine. He's making puzzle after brilliant puzzle and many of you have stated (with good reason) that this is your favourite sudoku of 2024 so far. It's called Quad Code and it WILL make you smile. Don't miss this one.
Play the puzzle at the link below:
sudokupad.app/7613uxdt7g
Rules:
Normal sudoku rules apply. In this puzzle, each digit from 1-9 is represented by a letter from A-I. You must determine which letter represents which digit. When discovered, these can be entered into the orange boxes at the bottom. The 2x2 area surrounding a quad circle must contain all the digits represented by the letters in that circle. The digits along a grey line can be divided into one or more non-overlapping groups of adjacent cells, each of which sums to 10. The digits in a blue or yellow cage must sum to the total in the top left corner. Enter correct digits near the grey fog cells to clear the fog. No guessing is necessary.
** NEW SANDRA & NALA FOG PACK **
A bonus sudoku pack was released on Patreon this week of 5 fog of war sudokus to celebrate the arrival of spring (in the Northern hemisphere) from Sandra & Nala. It's completely free - just click our Patreon link below.
Other treats on Patreon include:
- the new James Bond sudoku hunt competition;
- Simon's latest forays into the world of Islands Of Insight;
- Mark's video looking at the new OneUp puzzle from Rodolfo Kurchan;
- his solve of Region Geometry by Emre Kolotoğlu (3hr 36min long...!);
- and Mark's latest solve of The Times Club Monthly cryptic crossword
/ crackingthecryptic
** GET OUR FOG KICKSTARTER DELUXE & OUR BOOKS **
Check out this link for the kickstarter books and Fog Novella we've created over the years:
coffeebean.games/product-cate...
▶ SUDOKU PAD - Use Our Software For Your Puzzles ◀
You can input classic sudoku puzzles into our software and help support Sven, the programmer responsible for the wonderful user interface we all use to play these puzzles everyday. The app also comes with 12 handmade puzzles from us:
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Android:
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ALSO on Amazon: Search for “SudokuPad”
▶ Contents Of This Video ◀
0:00 Theme music & puzzle intro
1:21 If we can get to 600k subscribers...
2:12 Happy Birthdays
3:52 Rules
6:31 Start of Solve: Let's Get Cracking
▶ Contact Us ◀
Twitter: @Cracking The Cryptic
email: [e-mail]
Our PO Box address:
Simon Anthony & Mark Goodliffe
Box 102
56 Gloucester Road
London
SW7 4UB
(Please note to use our real names rather than 'Cracking The Cryptic'.)
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[@MaierFlorian]

SO sad that Simon totally missed the "HIDE" clue in the fog (which also would have disambiguated the last bit of pencilmarks).

[@Starcanum-]

Tbe one clue that managed to hide from him spells "HIDE"? I wouldn't have it any other way!

[@martysears]

The Hide clue can resolve some of the pencil marks, but still leaves an HI X wing which can only be resolved by the BIG clue at the end :)

[@TheMrEwe]

​@@martysears you did great. I laughed the entire time.

[@arnaudbrowet7872]

@@martysears The hide clue was the best fog reveal I ever encountered ! Congratulations, you are a genius sir.

[@studgerbil9081]

Simon has a particular genius for solving things the hardest, most roundabout way possible, while ignoring clues that are literally spelled out for him. I have given up on pulling my hair out and just enjoy the dramatic solves. Great puzzle for a great channel.

[@danielauto3767]

This must be the golden age of sudoku variants. The quality of the puzzles featured in this channel is jaw dropping.

[@TheMeanderingduck6]

28:52 - The easter eggs with the letters creating words at various points that were symbolic of themselves was amazing. This was a beautiful puzzle.

[@jonh6585]

Reminds me a bit of when Simon and Mark played through Typoman game on the live stream

[@RoderickEtheria]

Obviously, the Letter Tool was intended to be used for this puzzle. I got a CAGED HEADACHE working through this!

[@bronsonstephens3493]

Full of ‘AG’ which is the sound in old school newspaper comics that one lady says when something frustrates her. Not sure if FC is supposed to be another sound you make when frustrated with a headache Also HIDE being hidden.

[@waldolala2]

I completely missed the headache

[@coconuts2513]

That hide clue was incredible 🎉

[@vanciervancier]

The poor 'HIDE' clue was ignored and hidden from his mind.

[@Vic-hy2ml]

I SOLVED IT MYSELF!!!! omg it's the first puzzle i solved by myself I am so proud of myself

[@reidakted4416]

The way I understood D=5 is: Either H+E=10 (and therefore D=5) or H+E+A=10 AND H+E+C =10, which means A=C, which cannot be the case. (Alternatively, H+E+A+D=10 AND A+C+H+E =10, which mean D=C, which also cannot be the case).

[@martysears]

This is exactly the way I thought of it 😊

[@matthewphillips5911]

Exactly. This is the kind of puzzle I love: everything flows so naturally. D is the only digit not involved in a pair, so it's five, so the 4 digit 10-segment has a five, so A is 1 or 2 but... look there, the 5 revealed the "caged" (get it) clue. It's like getting rewarded for all the quad-clue sudoku you had to do to get there. Top notch... Marty is a genius.

[@enericm]

Initially, I thought E was 5 because it never appeared on any of the length 2 lines. Eventually, that led to a contradiction along the length 7 line, so I watched more of the video. Once I became convinced the rest of my logic was sound, I eventually settled on the logic above to find D. It took 2 hours, but it feels good to solve one of these mostly on my own.

[@soulus98]

The way I thought about it was like this: • Can H be 5? • HE can’t be 10 on either end of the line, since H and E are different • HEAD can’t be 10, and ACHE can’t be 10, since by triangularity it needs 1,2,3, and 4. Yet we already have a H=5 in both strings • Therefore HEA AND CHE must both be 10, and HE is common, so A = C, which we know is impossible Also DA would also be 10, but we already know A goes with G to make 10, so D should equal G which it can’t Rinse and repeat for E

[@johnh2052]

Exactly. It was easier _not_ to think about the 5 at all, but simply to look at which sequences could be 10. Then the 5 just falls out. Note that you also know the middle 4 digits of HEADACHE must sum to 10 (because of the 5 in the midst). So, immediately, A is 1 or 2, and C is 1 or 3. Looking at the CAGED clue quickly resolves this.

[@richardfarrer5616]

I've never played a sudoku which used so much wordplay. Truly stunning and, quite possibly, my favourite sudoku to date.

[@Paolo_De_Leva]

_"I don't know what sort of magic Mary Sears has been weaving over the sudoku community"_ (Simon @0:21) Some sort of elegant magic that makes you smile, I guess. Very effective over me‼👏👏👏👏👏 In this case, I smiled three times: 1) *CAGED* 😍 2) *HIDE* 😍 3) *BIG* 😍 Luckily, I missed the *HEADACHE,* 😁 and just enjoied its disambiguating logic 😍

[@KyleBaran90]

I like the aesthetic of a 9x10 sudoku with one row being "extra stuff"

[@pairot01]

Isn't it a 10x9 though?

[@KyleBaran90]

@@pairot01 Ah yes, in sudoku terms (row, column). I'm a programmer so my brain is always in (x,y) mode

[@UnaturalShadows]

@@KyleBaran90 i think you responded to that more graciously than i would have; its kind of unimaginable to me to use ‘3x4’ or whatever to refer to anything but (x,y)

[@vedrankordic9161]

@@KyleBaran90 I don't understand what being a programmer means here. I'm a programmer and it's quite natural to consider 9x10 to mean "nine rows, ten columns" because that's what programming languages commonly use to represent 2d arrays.

[@KyleBaran90]

@@vedrankordic9161 Oh! That actually depends on how the array is set up. If it's a language that supports multidimensional arrays, then array[x,y] is the notation used (though usually these are quite inefficient and I've never really seem them in use). The other is an array of arrays, eg array[y][x], which is more efficient and probably what you're referring to. I actually use nested for loops such that Y is on the outside and X is on the inner loop. When I wrote that comment I was referring to coordinate order, eg what OpenGL or other graphics-driven applications use. They always put X, then Y.

[@azland00123]

I laughed out loud and made my teenaged daughter look at me weird when big was revealed as the corner cage total. @Martysears absolutely brilliant puzzle.

[@anderesu91]

Maybe I'm missing something, but another way to see why H can be five is that you can't make a group of 4 digits that contains a 5 add up to 10.

[@cls022268]

This is much simpler than Simon's explanation

[@ikhouvandewii2]

I was thinking the same thing, so much easier!

[@Ogrecrusher]

Especially when that group contains 3 digits he's already said add to 10!

[@mccuskp1]

You can if you repeat digits, but here we'd be able to tell that you wouldn't have repeated digits given the letters we had.

[@Dodrebur]

Not without repeating anyway, which doesn't happen in the first or last 4 letters.

[@KyleBaran90]

You also missed that the fogged part of the grid had (HI)DE - HIDE! But you solved the 4s before you realized it

[@TheBioRules]

Gonna take a shot at explaining the HEADACHE in what I hope is a simpler way. We have HE at both the top and bottom of the word, and we don't know if either is a 5. Suppose one of them is a 5. If we only used 2 squares to make 10, then the other would also have to be 5, which is impossible per sudoku. Therefore, both sides must use at least 3 squares, so we extend each side to HEA and HEC. These cannot both add up to 10, because they contain a different digit (A vs C). Therefore, at least lease one of them must extend to 4 squares. If only one extends to 4 squares, that leaves a dangling square that can't add up to 10 by itself. Therefore, both would have to extend to 4 squares. This would leave us with HEAD and HEAC. These are again different by a digit, so they can't add up to 10. Therefore, neither H nor E can by 5. That means D must be 5, and H and E add up to 10. And the 3rd division must encompass the remaining letters in the middle.

[@martysears]

yep that's very similar to how I thought about it 👍

[@davidpayne7409]

To shortcut your logic, you can't make a group of 4 digits add up to 10 if one of them is a 5.

[@TheBioRules]

@davidpayne7409 actually you can, that's part of the solution. 5, 2, 2, 1

[@davidpayne7409]

@@TheBioRules But HEAD and HEAC are each four different digits so they can't repeat a digit - at the 4th sentence of your explanation.

[@TheBioRules]

@@davidpayne7409 that's a good point, I hadn't thought of that. I still don't think its a shortcut here though, because you first have to prove that 2 and 3 squares don't work.

[@KrisCadwell]

I'm kind of bummed that Simon didn't notice the HIDE quadruple. Just a cherry on top of all the other clever stuff in this puzzle.

[@Daymickey]

Marty - I truly didn’t want this puzzle to be over. I reluctantly solved it because I wanted it to keep going. I can’t explain how clever and genius this was.

[@martysears]

❤

[@louisesuth8141]

oooooh that CAGED - genius! now watched to the end, absolutely the most entertaining sudoku, excellent

[@steeevealbright]

This is one of my favorite sudokus I've ever done! It took me 39 minutes and I loved every second of it.

[@steeevealbright]

This is also the first time I've ever beaten the solver on CTC!! Huge moment for me. Monumental actually; gonna throw a party. 🥳

[@BibleInMe-sf2vw]

I've never attempted a sudoku puzzle and yet I've now watched like 10 of these videos. Simon just seems so fascinating and he's so polite.

[@martysears]

welcome in to this crazy world :D

[@MarkBennet10001]

Brilliant puzzle - great solve - the unfogged HIDE clue that I missed in my solve (so I finished as Simon did) was another gem.

[@MarkBennet10001]

HEADACHE reminded me of my youth and Douglas Hofstadter's classic Gödel Esher Bach and his wonderful Achilles and the Tortoise dialogues.

[@Happyjew666]

Once I discovered the HIDE clue, I noticed it, and then ignored it, thinking It's been used.

[@titusadduxas]

Whilst the hide clue existed I’m not sure you could have legitimately used it. It certainly wasn’t necessary as the box sums cleared that up.

[@Pfooh]

@@titusadduxas The HIDE clue resolves the FH pattern and would only leave the HI to solve. The other way around solves both.

[@Trandhal]

Cant believe after all this time the classic 3 in a corner song has finally evolved

[@thesatty]

69:35. I appreciate the "HEADACHE" along the long grey line.

[@AG_247]

Stunning and beautiful! I'm sitting here with my mouth open. Not only by the solve, but the creation is an absolute masterpiece! Thanks Marty Sears, thanks Simon.

[@ghandigoots]

Absolutely a gorgeous puzzle. How Marty was able to come up with something like this is well beyond me. This one was definitely made for Simon with all the "hidden" words

[@davidrattner9]

The puzzles on here daily are such a treat for us!! We are blessed to experience Simons contagious laugh, expressions and deductions as we see him solve just absolute beauties! Such an amzing community and channel to be part of!!

[@martysears]

It really is a fantastic community - thankyou David for all the positivity and lovely comments you regularly leave people

[@FabricioKarim]

I wonder what is hiding in the fog square.

[@AugustoValentini]

This is absolutely phenomenal! One of my favorite puzzles of all time, if not THE favorite! It's sublime what Marty did with the word clues

[@LarkyLuna]

For the diagonal solution at the 39:00 mark You found out that the only way you have a 5 in E or H is if they add up to 10 in HEA That means the other side has to be at least ACHE which is HEA + C => C = 0 (Alternatively you have 4 different digits in ACHE that sum up to then one of them being a 5, which needs something

[@sampathkumar-ej7xl]

Sometimes watching the solve gives you information that you would missed during your solve. After seeing the caged headache my appreciation of the puzzle setting was greater.

[@Sully800]

This is the greatest puzzle I’ve ever seen. Fun, rewarding, original, and still approachable. An amazing work of art!! As a bonus, by forcing me to solve the puzzle with letters I couldn’t repeatedly check if my deductions were correct, so I lost my usual crutch of making sure I didn’t break the solve. 55:19 for me!

[@dertigerbauch]

This landed in my top ten straight away. Thanks Marty for such a lovely puzzle ❤

[@GioPanStudios]

Another instant classic, easily one of my favorite puzzles I've ever done. Bravo, Mr. Sears!

[@LiviennaLives]

Truly brilliant!!!!

[@bobberry4905]

Absolutely awesome. Loved this one. Thanks Marty.

[@ps4403]

gave it a try and did it all by myself in 45:31! absolutely brilliant puzzle, it was so much fun

[@sjm6280]

So much care to set this wonderful puzzle! Not only providing a fun solve path, but with all those words perfectly fitting everywhere

[@splode7414]

I've been taking a little break from sudoku recently. What a treat it was that this puzzle was waiting for me to pick the hobby up again! Brilliant stuff, loved when the clues were revealed behind the fog... Just superb. :)

[@peterlewis1554]

I’ve never smiled more throughout the solving of a puzzle. Absolutely fantastic.

[@Gonzalo_Garcia_]

18:42 for me. This is probably the coolest puzzle I've solved this year, what a masterpiece!!

[@WeaselOnaStick]

oh my god, this is the first not-easy puzzle I tried in a long time and it was SO satisfying and exciting to see the line spell out a word!

[@simonmoore8776]

This was absolutely brilliant!

[@trace_tomorrow]

What an amazing puzzle. So funny and so clever the way things pick apart piece by piece. One of my favorite solves I’ve seen on the channel

[@thejuggler42]

This puzzle had so much personality! Loved it.

[@aWildKITsune]

I love when clues hide in plain sight~ Simon's just looking at the trees and forgetting the grass 😆 😆 😆 😆

[@adonnapryor5440]

This puzzle was fabulous!

[@brianshilling]

20:07. What a good one. Makes me want to dust off my cryptic crossword/sudoku I made awhile ago and send it in. It's maybe a little too simplistic, but we will see.

[@andersosterholm2538]

Absolutely brilliant puzzle!

[@MyriamTT]

Great Puzzle !!!!

[@MAUOMBO]

Fantastic!

[@RoboSparkle]

I would expect nothing less from the BWLO bloke! I saw the Headache coming after getting four of the letters because of my notations and, as much as I wanted to fill it in right away, I knew that Marty would absolutely punish people for assuming the answer. I was confident he'd go for the words, but it was impossible to be 100% certain which way he'd go, so had to solve it the slow way! Great puzzle, mate :)

[@martysears]

Mwahaha. Funnily enough I VERY nearly called this puzzle Quads With Letters On 😜

[@SomeRandomGuyOnYouTube]

Wait, Marty Sears is the guy who made Blocks With Letters On, of course! This explains a lot. BWLO is a work of genius too. In fact I must go and replay it, probably enough time has passed that I've forgotten how to solve most of it.

[@RichSmith77]

I just had the same reaction. I loved BWLO. Simon and Mark should do a live stream of playing that.

[@martysears]

@@RichSmith77 I would LOVE that :D

[@thezanycat]

One of the best sudokus I've ever done - bravo to the constructor Marty

[@puritan7473]

Another Stunning Puzzle that was great fun to solve - thank you Marty and Thank you Simon!!! The use of the letters making meaningful words was absolutely genius!!

[@mstmar]

i have a nice way to explain the headache. if h or e is 5, then h+e is not 10, as they cant both be 5s. since head and ache both contain 4 different digits including 5, they have to add to at least 5+1+2+3=11 so neither side can be a 4 region (or bigger). this leaves both as 3 cells, which don't add to the same thing.

[@zealot2147]

Basically how I did it. Supposing HE=/=10, then it can have a minimum of 6, a 1 and a 5. It can’t be 2 low digits since AG BI CF are the 10s. One could be a 3cell AHE CHE but the other can’t simultaneously. They can never be a 5 cell without repeating digits, AAHED would have 3 1s, so they could only be 2 4s, but HEAD=/=ACHE. Ergo, HE=10

[@janeflett4971]

Loved, loved loved this puzzle, great fun

[@titusadduxas]

51:19 - That was brilliant - the secret message made me smile but the logic was really lovely and not ludicrously difficult either. Take another bow Marty.

[@taliesintown9710]

My goodness, what a puzzle! I got to the point where I felt like instead of yelling at Simon, I should just do the puzzle myself and then got promptly stuck at the bit of logic needed around the 33 minute mark. However with a little help from Simon, I managed to finish the puzzle in an astonishing 67 minutes! I’m feeling very proud at having got my calculator out to do the cage sums and realising the non-cage digits had to sum to 5! Perhaps I should do some more puzzles along with Simon… excellent like always!

[@martysears]

Nice one, well done! Yeah I never intended the final sum to be a difficult and annoying sum, but then I realised I had got a bit lucky because 378 + 22 = exactly 400, which makes it nice and clear that the two uncaged digits must sum to 5

[@jenniferlenfestey5335]

Seriously funny, laughed out loud. Thank you Marty

[@BarryKort]

That was utterly amazing.

[@eduardoaltuna9336]

what a puzzle!! one of my alltime favourites for sure

[@Mephistokles333]

This was a lot of fun

[@Writchy]

Just brilliant, the fog timing and and then the BIG cage to sort out the final HI X-wing was magnificent! Many thanks Marty and Simon.

[@davidblake6889]

I was not sure if I was going to try this one. It looked a bit daunting. I am so glad I did! That was probably the best Sudoku I have ever solved. I did use the HIDE clue to get all the letters apart from the HI pairs, which Simon missed altogether. The best bit was the BIG cage total and using the 'secret' to get the value of B, and then doing the arithmetic on the whole grid to get the value of the HI pair in r1c9. Absolutely brilliant. This one should go down in the annals of Sudoku History. Marty Sears: take a bow my friend. The buzz I got from the finish was unlike anything I have done before. Thank you so much. (Sorry, but I did miss getting HEADACHE).

[@dudbike]

That was a brilliant puzzle.

[@user-bi3vs1kn5f]

You're the best sudoku solver I think)) And this puzzle is amazing! Watching this video was a pure pleasure. Thank you❤🎉

[@AllenMS828]

I loved this puzzle! I think this is the first time I've ever solved a puzzle faster than Simon (with the intro not included, even!).

[@scruffamudda6306]

Much fun. Marty, you are a legend :)

[@thenatundi9009]

Wow... just wow Marty is so good at coming up with great ideas!

[@GrantMcLean]

This puzzle is a masterpiece! Congratulations Marty on a beautiful creation.

[@salguido6828]

Been a while since I laughed out loud in a puzzle. Even more to have cackled at least three times! Beautiful puzzle, killer solve!

One of my favorite sudoku, period. I'm not an expert, so took me about 100 minutes to crack it, but enjoyed all seconds of it. :) Thanks Marty, not just for the puzzle, but for the "hidden" messages, too. :)

[@MrCoxmic]

fabulous finish

[@Qazqi]

Incredibly fun puzzle and I found it to be quite approachable on top. Thank you very much, Marty!

[@patrickcarrigan7848]

Brilliant puzzle, very entertaining solve. Great video, Simon!

[@siorac1147]

41:22. This is definitely a top 5 puzzle of all time for me. Enjoyed every minute of solving.

[@torstenaan]

Very nice puzzle!

[@rmelg9892]

I just solved it and now I will watch Simon tackle it. Simple brilliant puzzle!

[@spatulamahn]

Solved in 66:56 and loved this puzzle! First time I have ever solved a 50+ minute video puzzle!

[@warren_r]

I finished this one in 30 minutes.... how the heck does Marty Sears come up with this stuff? Absolutely incredible.

[@chocolateboy300]

I got 41 minutes. I was able to fill it almost all the way with letters 28 minutes in. Using the big line to figure out which numbers the letters could be was fantastic. Truly one of the best puzzles I have played. The logic flowed so well. Awesome Puzzle!

[@turun_ambartanen]

34:45 Beautiful setting. The hidden words are such nice surprises!

[@stevieinselby]

🤣🤣 Brilliant, Marty, had me laughing all the way through! I saw the headache developing before I had all the letters, it was really hard _not_ to just write the missing letters in but to make myself actually deduce them properly!

[@martysears]

Imagine you had seen it developing and then it had actually been like HGADACHE... everyone would have hated me, including myself haha

[@stevieinselby]

@@martysears Yes ... but I also didn't trust you not to do that 😎

[@BrianGwaltney]

This was so much fun to solve without any hints. Same sentiments as Simon.

[@DanielCoto93]

What an incredible fun puzzle. I really enjoyed it

[@cjdemontigmy]

Beautiful puzzle

[@danielmaryakhin3057]

These hidden easter eggs are brilliant!

[@MattYDdraig]

21:10 Utterly genius and I loved the clue hidden under the fog on the right. Sublimely clever and stunningly approachable.

[@bkoholliston]

That was very fun but just nuts! Marty is a genius.

[@mats1365]

I’m in absolute awe of this puzzle. It just seems impossible to me to create something like this. And luckily, it wasn’t too difficult, so I got to enjoy all the magic for myself

[@emilywilliams3237]

Everything you said about this is true, Simon - it is clever, funny, and so elegant. And I think it just might be within my ability to solve, so it is now on my list for when I have an hour or so to spare (since it will take me longer than it took you, for sure, even after watching your solve). Thank you for the fun! If this is one of the best puzzles of the year, then I would have to say that this is one of my favorite videos of the year.

[@davidrattner9]

Always cherish your prose Emily!!!

[@emilywilliams3237]

@@davidrattner9 And I cherish your encouragement, David. You are a gem.

[@colinbrash]

This was awesome, so fun to solve!

[@chrissjackson6488]

I think this may be my favorite puzzle ever created. I often find some endings lacking, but this one was beautiful all the way to the end.

[@piarittersporn]

What an ingenious and beautiful puzzle.

[@nickyhaflinger]

Simon you missed the Hide under the fog. Yet another pun in this brilliant puzzle.

[@asifhassan9140]

What fun puzzle!

[@JediJess1]

What an incredible puzzle! A very cheeky one with lots of personality too! I can even begin to imagine how long this would've taken to come up with, let alone troubleshooting while setting. Bravo Marty!

[@martysears]

thanks very much Jess. Took a few late nights in a row trying to make sure all the information unfolded in the correct order

[@JediJess1]

@@martysears I can imagine. Once again, incredible work! I look forward to seeing more of your works

[@BozoTheBear]

Absolutely outstanding!!! Definitely the most amusing sudoku I've seen!!! So ridiculously clever :-)

[@Tepalus]

34:47 for me. What an odd puzzle. And quiet a unique way of using the Fog Of War rule! Loved it.

[@tealbaron2808]

marty sears never ceases to amaze me. genuinely one of the best and most inspiring setters doing it right now

[@martysears]

❤ thankyou, that's lovely

[@armengabriel]

@@martysears you're a genius!

[@KSilverlode]

This puzzle was very clever and a lot of fun!

[@jmurt6379]

That was such a beautiful puzzle with wonderful construction! Loved the use of the letters and words that are spelled out in the clues. Was able to complete it in 21:55, and would absolutely recommend this puzzle!

[@Anne_Mahoney]

What a clever puzzle -- this was great fun. 😸