I was really impressed up to a certain point, then I reached the point where the prime constraint is only used in the 78 cage and the rest is pure knight elimination and I got a bit bored. The basic principle was really cool though, I'm looking forward to the next one.
What a strange puzzle. The prime number cages at the start are really original and enjoyable to solve. But then it completely abandons that idea and switches to agonizingly difficult knights move eliminations. To me it was really frustrating.
I'm impressed with your scanning! You see things so quickly and do such great work! And you are so much fun to watch, because you explain your actions and thoughts so well! Thank you for always being a great puzzle master and an awesome person!
Are you new to the channel? There's not much reason to be impressed with his scanning - he used to be much better at it few years back. And he tends to do more circular reasoning nowadays than before (e.g. that nonsense with 8s at around 33:00 mark - why the heck does he that chain starting with 8 in R4C3? An 8 in that position leaves no place for 8 in box1 because of knight's move, and that's that).
This was another tedious sudoku puzzle once the clues were used up. Though, it is a good one to train your brain on the knights move rule. I hadn't done one before and I was really struggling to find the constraints and finish the puzzle. I had to resort to watching this video to get a couple clues. I just couldn't see the moves.
Really struggle with anti-knight, and spent a lot of time missing anti-knight deductions, but love FoW so didn't give up, figuring there was always a knight's move to find somewhere. Solved in 31:11.
Mark using the cage at about 21:00 to rule out a seven from r4c6 while ignoring the seven in r9c6 reminded me of Simon. He is usually the one who ignores the easy sudoku and comes up with a more complicated proof.
You amuse me, Mark, but it seems that the little red knight did his job tonight almost all the way through! Thanks for this excellent video - despite a little hiccup, I think you get an A+ in secondary school!
I got stuck at the same spot as Mark, but with a 18 instead of 17 on r4c3. I solved it using colouring, which made it much easier. I really enjoyed it 👍
I finished in 33:47 minutes. I found it difficult to calculate all the primes in my head so I wrote them down. Focusing on where the 8 should go gave me the break-in, which did not feel easy. After that, it became a lot easier and enjoyable. As always, it feels good to beat Mark's time. Great Puzzle!
hi! i wanted to say i appreciate the adding of timestamps in the videos lately. sometimes i just wantbto get straight to the sudoku! love your channel as always!
This puzzle reminded me of some older knights move puzzles where it was just pure observation n scanning required...the prime number concept was great...well done mark for the perseverance
I got awfully stuck when about box 1 remained foggy. Came for help... I managed to see the 1, but not the impact of the 79 pair. The last two thoughts were not fun. An extra clue to move this along would have made it more fun.
This kind of knights puzzles are very hard for me. Take so much time to find the "right cell". I think would be easier if had more cages to help us. Anyway thanks for your solving 😊
Love the horse!! Thank you for showing me the way forward at 43:26 i was as stuck as you were, for even longer allready. This was though so far, now let's see how the finish is. And that last sprint was not that hard any more. 108:17 i think that's good enough in my book for this beast.
Finished in 34:08 - always excited when I beat Mark's video length! (never mind that I have error checking on and am not explaining my solve to an audience, lol)
Finished in 18:53, felt like I blitzed it - nice puzzle! [edit] Watching Mark, I realise that I assumed R4C5 was even (since the previous cages in R8 had all been even-odd), forcing R4C4 and R6C4 to be a 47 pair - it happened to be correct, made things a lot easier, and explains why I'm so much quicker than the other times listed so far
when you did 3+6 = 9 you had 9 in 3 positions. But then you cleared 2 of them. You didn't realize that because 9 is a circle, it can't go in a blank cell that has just been revealed as a blank cell.
In the beginning, it is quite easy to spot the single 5 in the middle of row 8. There are 4 double digits prime, which add to an even number. So the middle digit must be odd, which can only be 5.
My reasoning was the the only prime starting with 5 is 53, and no primes end in 5. But the only prime starting with an 8 is 83 and no prime ends in 8. Therefore to avoid duplicating a three either the 5 or the 8 has to go in the single cell and only the 5 is prime.
About 53 min for me. Had a good start, and then kept hitting various dead ends until I was able to catch small naked singles here and there to move forward. Not a bad puzzle at all!
My problem, when it comes to knight's move constraints, is not that I keep forgetting it. Once I'm locked in, it becomes the first thing I consider when thinking about any digit. My problem is that for at least the next two puzzles I attempt, I can't stop making erroneous illiminations as i try to apply the same constraint to puzzles which don't include it.
Solved in 31:07. Happy to see times posted which were just a little slower. I needed about 10 minutes for row 8 and also pretty long for the naked single 1 in r4c3 (31:00 in this video).
This puzzle was so difficult for me! I mean, I enjoyed it very much, I'm just not used to struggling that much. And it wasn't even the prime number part that was difficult, it was the top half and remembering the knight's move.
Not my favorite puzzle. Grinding through knights move deductions cell by cell... It felt like the solve path called for brute force instead of something more elegant.
If cages are read _from left to right_ then it wouldn't be possible to fill the grid with cages, because c9 would need to have 4, 6 and 8 somewhere in it and they can never be the units digit of a prime number. If the rules added _or top to bottom_ then maybe it could be possible?
I learned from this puzzle... that I am not that great at scanning when it comes to Knight's move constraint. While it is an amazing puzzle, I personally didn't enjoy this one.
Rules: 03:22 Let's Get Cracking: 05:01 Mark's time: 47m20s Puzzle Solved: 52:21 What about this video's Top Tier Simarkisms?! Three In the Corner: 2x (49:57, 52:11) The Secret: 1x (05:23) Phistomefel: 1x (01:31) And how about this video's Simarkisms?! Ah: 12x (03:32, 03:53, 05:10, 15:02, 21:44, 23:36, 24:45, 25:40, 31:35, 32:51, 46:41, 47:07) Goodness: 8x (38:29, 41:24, 42:02, 43:35, 45:44, 51:37, 52:00, 52:19) Sorry: 8x (02:56, 06:34, 11:10, 14:30, 26:07, 33:23, 34:08, 46:54) In Fact: 5x (05:27, 05:47, 28:34, 33:18, 47:17) Hang On: 4x (23:54, 23:54, 23:54, 23:54) Pencil Mark/mark: 4x (36:34, 43:53, 44:26, 51:50) Clever: 3x (29:40, 29:44, 43:09) Brilliant: 3x (02:07, 03:00, 13:44) Obviously: 3x (06:28, 21:00, 39:42) Wow: 3x (04:34, 32:18, 49:50) Naked Single: 2x (18:48, 18:57) Missing Something: 2x (22:45, 38:42) Stuck: 2x (12:06, 40:29) Deadly Pattern: 2x (50:03, 52:09) By Sudoku: 2x (17:13, 45:20) I've Got It!: 2x (43:12, 43:12) Intriguing: 2x (04:34, 08:57) Progress: 2x (10:02, 27:20) Symmetry: 2x (31:21, 33:55) Naughty: 1x (48:23) Shouting: 1x (29:33) Approachable: 1x (27:27) Proof: 1x (15:49) We Can Do Better Than That: 1x (09:40) That's Huge: 1x (47:11) Weird: 1x (31:19) Most popular number(>9), digit and colour this video: Eighty Three (6 mentions) Two (102 mentions) Black (10 mentions) Antithesis Battles: Even (17) - Odd (16) Black (10) - White (5) Row (29) - Column (12) FAQ: Q1: You missed something! A1: That could very well be the case! Human speech can be hard to understand for computers like me! Point out the ones that I missed and maybe I'll learn! Q2: Can you do this for another channel? A2: I've been thinking about that and wrote some code to make that possible. Let me know which channel you think would be a good fit!
I haven't watched this video yet, but I have watched all three of your very impressive Countdown performances so far! Great entertainment, but terrible for the TH-cam metrics! Your speed on Monday's conundrum blew me away. 😂
At 8:16, did I miss something, or are there actually 3 places for a 1 in that row 8? It worked out because the fog confirms it did, but I don't think r8c6 was ruled out explicitly?
R8C6 couldn’t be a 1 due to the 1379 quadruple in columns 2, 4, 7, and 9 of row 8. The marked 1 option in R8C6 was simply forgotten and could already be removed. It’s clear that Mark had already removed it mentally as the quadruple was fresh to mind, but hadn’t gotten to removing it physically.
@@nicholasstultz Ah, you're right. It's definitely there, but Mark had moved on from the quadruple without tidying up a couple steps ago, so I forgot about it.
This is the first puzzle featured on the channel that I feel I could have finished but lost interest and just closed it about 2/3 of the way through. Started off so original and for the first 10 minutes I loved it, then I quickly realised the rest of the puzzle was likely just going to be "scan these knights moves to find the only number that will fit in this box" and lost all interest. Some people may absolutely love this type of puzzle, but it's definitely not for me.
Someone else raised this same point below. It was pointed out that there's a 1379 quadruple in the row (in the units places of the primes). Only two of those could be the 1 of the quadruple. I don't think it was explained by Mark, though.
@@RichSmith77 Yes, now I see why col6 cannot be the 1, but the point of these videos is to show (teach) us the way to make the deductions. Still, I learnt a lot today too. :)
@@segmentkings It could equally be that Mark just didn't see the pencil marked 1 in r8c6. After all, he missed seeing a pencil marked 5 in box 2 later. 🙂
I ended up making the same mistake as Mark did, also checking all the numbers till the same 8s collided. :-) How did the show went? Does anybody know? I have no idea how to find it out myself...
I'm pleased to see that I'm not quite as dense as I thought I was at the time! (edit: I mean, of course, because I got stuck at the exact same place, rather than trying to claim that I'm smarter than Mark(!))
It's so funny when you watch you listen, and the "I feel like that has to be a 3", but have no proof. Just after the "I've not forgotten the knights move"". When 3 is ruled out from every other cell in box 8. 15:40 😄
Now that you mentioned it and I returned to see it, I'm not sure. I only placed it after filling out row 2. Maybe Mark remembered the previous pass. EDIT: Whoops, it was the only place for 4 in row 3 then.
29:40 I am stuck a little beyond this. First, use block 5 to show that R4C3 can't be 7. Then use the prime and blocks 2 and 3 to show that the 8s in row 2 are forced into block 1, and then R4C3 is 1. That's now where I'm stuck. 30:00 For me, that 68 cell is sandwiched in a chocolate-teapot triple in row 5. 35:50 You've done the 8 part. The 7 part remains. 7 in block 5 rules out 7 from R4C3. 41:40 I'm not-shouting, "7 in block 5!" 43:30 Finally! 46:10 I've finished the puzzle. I think the next step is the 79 pair in block 7 and 7 in block 4. 48:30 The 4 in R4C4 and the dot, now. It will soon be caught, with less than four and a half minutes left in the video. 49:10 The 5 in R3C4 was a mistake. There was a certain humor right at the end, when the puzzle came back to bite him as he confidently entered digits to wrap up the puzzle. Upon replay, I just noticed that Mark didn't notice the fog's vanishing only upon placing the 3 just after the 5. (I didn't notice it either.)
It is strange how people can create an interesting puzzle, but cannot make a logical sentence to set the rules in a way that everyone would understand, not just the ones who have done puzzle with such rules sets before and do understand the concept. It took me more than an hour and actually to watch this video prior to trying to solve it, just to realise, that "each cage contains a prime number read from left to right" actually means that each cage IS a prime number, that CONTAINS sudoku digits and is visualised as written and not adding those digits together, f.e. domino cage of [ 2 I 3 ] is read as prime number 23. What a shame. Flipsen should first get his primary education before going to secondary. GL all solvers.
I'm choosing not to finish this one lol. I got the same all everyone else did and just don't want to spend forever scanning every remaining cell. Not a great puzzle unfortunately.
Poor old 1 - When will mathematicians let it into the prime-party. It's the primest prime that ever primed. Not only is it only divisible by 1 and itself, there ARE no other numbers. How prime does a number have to be? :)
If you don't want to watch a video that comes up, you don't have to, even if you are subscribed to the channel. Just ignore the ones you don't want to watch. No need to be insulting, however veiled.
I was really impressed up to a certain point, then I reached the point where the prime constraint is only used in the 78 cage and the rest is pure knight elimination and I got a bit bored. The basic principle was really cool though, I'm looking forward to the next one.
What a strange puzzle. The prime number cages at the start are really original and enjoyable to solve. But then it completely abandons that idea and switches to agonizingly difficult knights move eliminations. To me it was really frustrating.
Me too! It felt like hitting a brick wall at 100 MPH
Agreed. Maybe the setter did well for his skill level, but it seems like it could have been done better.
I did this one in 31:23.... I really liked working through the solution to that first unfogged row. Very cool.
I'm impressed with your scanning! You see things so quickly and do such great work! And you are so much fun to watch, because you explain your actions and thoughts so well! Thank you for always being a great puzzle master and an awesome person!
Are you new to the channel? There's not much reason to be impressed with his scanning - he used to be much better at it few years back. And he tends to do more circular reasoning nowadays than before (e.g. that nonsense with 8s at around 33:00 mark - why the heck does he that chain starting with 8 in R4C3? An 8 in that position leaves no place for 8 in box1 because of knight's move, and that's that).
This was another tedious sudoku puzzle once the clues were used up. Though, it is a good one to train your brain on the knights move rule. I hadn't done one before and I was really struggling to find the constraints and finish the puzzle. I had to resort to watching this video to get a couple clues. I just couldn't see the moves.
Very enjoyable puzzle, and amazing from Mark to backtrack his own mistakes and still remember the logic leading up to where it went wrong!
Probably the hardest puzzle on this channel that I actually managed to solve
Really struggle with anti-knight, and spent a lot of time missing anti-knight deductions, but love FoW so didn't give up, figuring there was always a knight's move to find somewhere. Solved in 31:11.
28:32
Really nice use of the prime number restraint in the first half. Would love to see a version with more of that.
Mark using the cage at about 21:00 to rule out a seven from r4c6 while ignoring the seven in r9c6 reminded me of Simon. He is usually the one who ignores the easy sudoku and comes up with a more complicated proof.
You amuse me, Mark, but it seems that the little red knight did his job tonight almost all the way through! Thanks for this excellent video - despite a little hiccup, I think you get an A+ in secondary school!
He deservedly thanked you for it, Emily!
I love the deduction at 37:35, when Mark said it would make two thirds of a pair!
I got stuck at the same spot as Mark, but with a 18 instead of 17 on r4c3. I solved it using colouring, which made it much easier. I really enjoyed it 👍
I finished in 33:47 minutes. I found it difficult to calculate all the primes in my head so I wrote them down. Focusing on where the 8 should go gave me the break-in, which did not feel easy. After that, it became a lot easier and enjoyable. As always, it feels good to beat Mark's time. Great Puzzle!
hi! i wanted to say i appreciate the adding of timestamps in the videos lately. sometimes i just wantbto get straight to the sudoku! love your channel as always!
At timestamp 49:15 it seems like placing the 5 in box 2 didn't follow from the stated deduction -- theres still the possibilty of a 5 in r3c6.
Which Mark catches.
This puzzle reminded me of some older knights move puzzles where it was just pure observation n scanning required...the prime number concept was great...well done mark for the perseverance
I got awfully stuck when about box 1 remained foggy. Came for help... I managed to see the 1, but not the impact of the 79 pair. The last two thoughts were not fun. An extra clue to move this along would have made it more fun.
This kind of knights puzzles are very hard for me. Take so much time to find the "right cell". I think would be easier if had more cages to help us. Anyway thanks for your solving 😊
1:29:42 - I got the break in quite quickly and it was all flowing very well until I got completely bogged down in the top left corner.
Love the horse!!
Thank you for showing me the way forward at 43:26 i was as stuck as you were, for even longer allready.
This was though so far, now let's see how the finish is.
And that last sprint was not that hard any more. 108:17 i think that's good enough in my book for this beast.
Well done Mark! A good lesson in perseverance as much as anything else.
45:46 ... I struggled on this one for a while, but I'm happy to have made it through
Nice puzzle!
Finished in 34:08 - always excited when I beat Mark's video length! (never mind that I have error checking on and am not explaining my solve to an audience, lol)
Finished in 18:53, felt like I blitzed it - nice puzzle!
[edit] Watching Mark, I realise that I assumed R4C5 was even (since the previous cages in R8 had all been even-odd), forcing R4C4 and R6C4 to be a 47 pair - it happened to be correct, made things a lot easier, and explains why I'm so much quicker than the other times listed so far
when you did 3+6 = 9 you had 9 in 3 positions. But then you cleared 2 of them. You didn't realize that because 9 is a circle, it can't go in a blank cell that has just been revealed as a blank cell.
In the beginning, it is quite easy to spot the single 5 in the middle of row 8. There are 4 double digits prime, which add to an even number. So the middle digit must be odd, which can only be 5.
My reasoning was the the only prime starting with 5 is 53, and no primes end in 5. But the only prime starting with an 8 is 83 and no prime ends in 8. Therefore to avoid duplicating a three either the 5 or the 8 has to go in the single cell and only the 5 is prime.
@@fakjbf3129 What about 59 and 89?
About 53 min for me. Had a good start, and then kept hitting various dead ends until I was able to catch small naked singles here and there to move forward. Not a bad puzzle at all!
My problem, when it comes to knight's move constraints, is not that I keep forgetting it. Once I'm locked in, it becomes the first thing I consider when thinking about any digit. My problem is that for at least the next two puzzles I attempt, I can't stop making erroneous illiminations as i try to apply the same constraint to puzzles which don't include it.
I have the same issue with proximity constraints 🤣
Solved in 31:07. Happy to see times posted which were just a little slower. I needed about 10 minutes for row 8 and also pretty long for the naked single 1 in r4c3 (31:00 in this video).
48:06 for me. star t was fine, but the ending was ridiculously hard.
This puzzle was so difficult for me! I mean, I enjoyed it very much, I'm just not used to struggling that much. And it wasn't even the prime number part that was difficult, it was the top half and remembering the knight's move.
Not my favorite puzzle. Grinding through knights move deductions cell by cell... It felt like the solve path called for brute force instead of something more elegant.
Finished in 40:01 with help from the video with getting started and getting unstuck.
When the fog didn't clear when the misplaced 5 was entered, I knew there was trouble.
@33:33 -- The knight move strikes again: No matter where you put the 7 in row 6, there cannot be a 7 in r4c3.
Ha; in England visiting my mum; turn on the TV and it’s Mark’s ugly mug on Countdown :-) it’s a bloodbath!
If cages are read _from left to right_ then it wouldn't be possible to fill the grid with cages, because c9 would need to have 4, 6 and 8 somewhere in it and they can never be the units digit of a prime number. If the rules added _or top to bottom_ then maybe it could be possible?
I learned from this puzzle... that I am not that great at scanning when it comes to Knight's move constraint. While it is an amazing puzzle, I personally didn't enjoy this one.
I got this in 37:48. At least half that time was spent on the break in. I didn’t immediately pick up on the restriction on 5
Took me forever to notice what r4c3 was doing. But I'm pleased that I saw it eventually!
Some tricky knight eliminations but over all a fun puzzle.
Rules: 03:22
Let's Get Cracking: 05:01
Mark's time: 47m20s
Puzzle Solved: 52:21
What about this video's Top Tier Simarkisms?!
Three In the Corner: 2x (49:57, 52:11)
The Secret: 1x (05:23)
Phistomefel: 1x (01:31)
And how about this video's Simarkisms?!
Ah: 12x (03:32, 03:53, 05:10, 15:02, 21:44, 23:36, 24:45, 25:40, 31:35, 32:51, 46:41, 47:07)
Goodness: 8x (38:29, 41:24, 42:02, 43:35, 45:44, 51:37, 52:00, 52:19)
Sorry: 8x (02:56, 06:34, 11:10, 14:30, 26:07, 33:23, 34:08, 46:54)
In Fact: 5x (05:27, 05:47, 28:34, 33:18, 47:17)
Hang On: 4x (23:54, 23:54, 23:54, 23:54)
Pencil Mark/mark: 4x (36:34, 43:53, 44:26, 51:50)
Clever: 3x (29:40, 29:44, 43:09)
Brilliant: 3x (02:07, 03:00, 13:44)
Obviously: 3x (06:28, 21:00, 39:42)
Wow: 3x (04:34, 32:18, 49:50)
Naked Single: 2x (18:48, 18:57)
Missing Something: 2x (22:45, 38:42)
Stuck: 2x (12:06, 40:29)
Deadly Pattern: 2x (50:03, 52:09)
By Sudoku: 2x (17:13, 45:20)
I've Got It!: 2x (43:12, 43:12)
Intriguing: 2x (04:34, 08:57)
Progress: 2x (10:02, 27:20)
Symmetry: 2x (31:21, 33:55)
Naughty: 1x (48:23)
Shouting: 1x (29:33)
Approachable: 1x (27:27)
Proof: 1x (15:49)
We Can Do Better Than That: 1x (09:40)
That's Huge: 1x (47:11)
Weird: 1x (31:19)
Most popular number(>9), digit and colour this video:
Eighty Three (6 mentions)
Two (102 mentions)
Black (10 mentions)
Antithesis Battles:
Even (17) - Odd (16)
Black (10) - White (5)
Row (29) - Column (12)
FAQ:
Q1: You missed something!
A1: That could very well be the case! Human speech can be hard to understand for computers like me! Point out the ones that I missed and maybe I'll learn!
Q2: Can you do this for another channel?
A2: I've been thinking about that and wrote some code to make that possible. Let me know which channel you think would be a good fit!
I haven't watched this video yet, but I have watched all three of your very impressive Countdown performances so far! Great entertainment, but terrible for the TH-cam metrics! Your speed on Monday's conundrum blew me away. 😂
At 8:16, did I miss something, or are there actually 3 places for a 1 in that row 8?
It worked out because the fog confirms it did, but I don't think r8c6 was ruled out explicitly?
R8C6 couldn’t be a 1 due to the 1379 quadruple in columns 2, 4, 7, and 9 of row 8. The marked 1 option in R8C6 was simply forgotten and could already be removed. It’s clear that Mark had already removed it mentally as the quadruple was fresh to mind, but hadn’t gotten to removing it physically.
@@nicholasstultz Ah, you're right. It's definitely there, but Mark had moved on from the quadruple without tidying up a couple steps ago, so I forgot about it.
Got stuck on the deduction about row 2, but apart from that managed to eke out a solution.
Surprisingly difficult for me. I got stuck a lot once the cages were used up.
At 8:15 the one digit can go into three places, not two...
This is the first puzzle featured on the channel that I feel I could have finished but lost interest and just closed it about 2/3 of the way through. Started off so original and for the first 10 minutes I loved it, then I quickly realised the rest of the puzzle was likely just going to be "scan these knights moves to find the only number that will fit in this box" and lost all interest. Some people may absolutely love this type of puzzle, but it's definitely not for me.
I think that experienced chess players have an advantage when it comes to knight's restriction.
I assumed that r4c5 couldn't be 7 after placing 3 in r4c6 because 7+3 = 10 not a prime number. I don't know if I was supposed to do it like that.
Great video. Thanks Mark!
Where has all the GAS gone ?
"77 is not a prime". Correct. Also is not really an option for a domino 😀
A nice opening
At 9:25 You say 1 can only go in one place, but it's pencilmarked in column 6 too at this point. Why was this option ignored?
Someone else raised this same point below. It was pointed out that there's a 1379 quadruple in the row (in the units places of the primes). Only two of those could be the 1 of the quadruple. I don't think it was explained by Mark, though.
@@RichSmith77 Yes, now I see why col6 cannot be the 1, but the point of these videos is to show (teach) us the way to make the deductions.
Still, I learnt a lot today too. :)
@@segmentkings It could equally be that Mark just didn't see the pencil marked 1 in r8c6. After all, he missed seeing a pencil marked 5 in box 2 later. 🙂
Isn't it annoying how many primes end in a 3 or 7? Looking forward to the College themed one based on the Cauchy-Schwarz Inequality....
Wonderful foggy.
I ended up making the same mistake as Mark did, also checking all the numbers till the same 8s collided. :-) How did the show went? Does anybody know? I have no idea how to find it out myself...
guess which celebrity I saw on Countdown 💪💪💪 how exciting to see Mark 😄😄😄
37:51 for me. I enjoyed the break-in, but it got way too tedious after that.
I'm pleased to see that I'm not quite as dense as I thought I was at the time! (edit: I mean, of course, because I got stuck at the exact same place, rather than trying to claim that I'm smarter than Mark(!))
It's so funny when you watch you listen, and the "I feel like that has to be a 3", but have no proof. Just after the "I've not forgotten the knights move"". When 3 is ruled out from every other cell in box 8. 15:40 😄
72:15 ... lovely but tricky for me
Congratulations on 4 wins Mark, hahaha found out you were on Countdown purely by happenstance
38:48 for me. I stalled for a bit near the end.
did this in about 75 minutes, fun but a little difficult trying to find the little knights xd
Completed in 24m24s.
48:27 for me. Nice puzzle!
I did cheat a bit and looked up all the prime numbers before i started the solve.
This puzzle was frustrating. I ran into the same problem. There's no good logic in the top left at all
Wait. At 51:55 how are you getting a 4 in row 3 column 5? It turned out correct but I have no idea how you got that digit at that point.
Now that you mentioned it and I returned to see it, I'm not sure. I only placed it after filling out row 2. Maybe Mark remembered the previous pass.
EDIT: Whoops, it was the only place for 4 in row 3 then.
4 can't go anywhere in that row because there's already a 4 in box 1.
29:40 I am stuck a little beyond this. First, use block 5 to show that R4C3 can't be 7. Then use the prime and blocks 2 and 3 to show that the 8s in row 2 are forced into block 1, and then R4C3 is 1. That's now where I'm stuck.
30:00 For me, that 68 cell is sandwiched in a chocolate-teapot triple in row 5.
35:50 You've done the 8 part. The 7 part remains. 7 in block 5 rules out 7 from R4C3.
41:40 I'm not-shouting, "7 in block 5!"
43:30 Finally!
46:10 I've finished the puzzle. I think the next step is the 79 pair in block 7 and 7 in block 4.
48:30 The 4 in R4C4 and the dot, now. It will soon be caught, with less than four and a half minutes left in the video.
49:10 The 5 in R3C4 was a mistake.
There was a certain humor right at the end, when the puzzle came back to bite him as he confidently entered digits to wrap up the puzzle.
Upon replay, I just noticed that Mark didn't notice the fog's vanishing only upon placing the 3 just after the 5. (I didn't notice it either.)
just snuck in under half an hour - 29:59 !
It is strange how people can create an interesting puzzle, but cannot make a logical sentence to set the rules in a way that everyone would understand, not just the ones who have done puzzle with such rules sets before and do understand the concept. It took me more than an hour and actually to watch this video prior to trying to solve it, just to realise, that "each cage contains a prime number read from left to right" actually means that each cage IS a prime number, that CONTAINS sudoku digits and is visualised as written and not adding those digits together, f.e. domino cage of [ 2 I 3 ] is read as prime number 23. What a shame. Flipsen should first get his primary education before going to secondary. GL all solvers.
I'm choosing not to finish this one lol. I got the same all everyone else did and just don't want to spend forever scanning every remaining cell. Not a great puzzle unfortunately.
Poor old 1 - When will mathematicians let it into the prime-party. It's the primest prime that ever primed. Not only is it only divisible by 1 and itself, there ARE no other numbers. How prime does a number have to be? :)
45:55 for me
The start was decent, but the second half was an unfun slog. Not recommended.
39:41 for me and solver #910.
66:11
55 minutes
How can I subscribe to Simon without getting this...?
What
Don't be rude. \
They come as a pair!
why would you ever want that anyway lol
If you don't want to watch a video that comes up, you don't have to, even if you are subscribed to the channel. Just ignore the ones you don't want to watch. No need to be insulting, however veiled.