Hello, Lithium-Ion here. Many thanks for the feature and the kind words. Mark pretty much followed the intended solve path and spotted the break-in in Box 1 incredibly fast. Thanks Mark for your ongoing enthusiasm for Sudoku puzzles and clearly describing the checkerboard logic and how to apply it to this puzzle. The only thing that would have simplified something even more, would be the 48 pair in R3C8/R3C9 😉 So have fun with this puzzle and don't let the black mamba bite you!
I started solving at the same time I started watching the video (which gives me a bit of a head start). Sometimes I observe Simon or Mark follow the exact same solve path as me, but not tonight. I finalized the snake cells in boxes 5/6/8/9 before boxes 1/2/3. I think it helped that I noticed the even/odd thing earlier than Mark did. The logic was very interesting in my solve path, but distinctively different than Mark's. So, it seems that there are multiple ways to solve this one. Either way is great fun! Thank you for the puzzle!
"Within each box, the box number is part of the snake" That is only possible if the snake visits every box. Simon's puzzle today (2024-07-17) has a variation on that rule that explicitly says that _if_ the snake visits box N _then_ the digit N must be on the snake in that box - the variation on the wording is key.
I finished in 39:47 minutes. This was a fun ruleset and puzzle. I had forgotten that the pathway was in clock type pattern and wrongly assumed that it must go counter-clockwise, before seeing that it broke in box 6, unable to get into box 5. The negative constraint is so powerful and quite enjoyable in this sudoku. Great Puzzle!
Mark Goodliffe has the so called "Mamba Mentality". The Black Mamba, found on the African Savanna, is the world's most feared snake, not because it has the most poisonous venom (That Crown belongs to the Golden Lance-Head Pit Viper), but rather because the Black Mamba strikes without provocation...! You don't see it coming, and then BOOM, it's too late...! Long Live Mark Goodliffe...!
I usually shy away from snake puzzles (though I have no particular problem with snakes themselves), but this one looks ... doable. Especially if I were to have the video at hand to help me make my way through the tufts of grass, Mark. Thanks for this, very fun!
Lovely break in and snake puzzles are my favourite. Negative constraints are tough to keep in mind but it was integral for this puzzle everywhere, each time I used it it was satisfying 🤠
15:18 Incredibly I remembered the negative constraint throughout for the first time ever, I think. That with the initial box 1 deduction does yeoman's work in locating the mamba, and its number friends.
Random thoughts: A *line* "moves" through the center of cells... A *1-cell wide snake* "moves" from cell to cell... A *train* travels along a 1.4 m wide railway...
I remember having a similar thought. How does a one-cell wide snake travel through the centre of cells? Passing through the centre of cells is usually reserved for loop lines.
@RichSmith77 Thanks for replying. I think most people do not mind about improper terminology, as long as they can understand what's the intended meaning.
Finished in 41:41. I totally forgot about the negative constraint rule until after mulling for a good 20-25 minutes the break-in. Once I remembered the negative constraint, everything else flowed. Fun puzzle!
What a great puzzle. This one took me just over 25 minutes. Interestingly, I took a different solve path to Mark as once I’d seen the trick with 1 in box 1, the thing that struck me as most constrained was how to go through 2 in box 2. I think that approach made it a bit quicker as more of the bottom is disambiguated by the time you’re considering the snake’s path? Either way, I thoroughly enjoyed this one! 😊
I would probably never finish this if I didn't watch how Mark started the puzzle. For some reasons my brain didn't register the rule that requires you to include the box number in the snake too and somehow interpreted it just as the snake must pass through every box. Even when i was watching Mark, I was still confused like where did Mark get the rule from? Why 1? lmao.
I remembered the negative constraint rule and somehow managed to forget we were told the snake ends in box 9! Doh!! I treated it as if it had to start in box 5 and, since it needed to visit every box, I determined it had to end in a corner box. (Which I now realise was another error because there's no reason the snake couldn't revisit a box). Somehow I still reached the same solution. 😂
At around 15:09, why must the seven be in r7c3 and not in r8c3 or r9c3 with r7c3 being a five? AHA, I forgot therule that the box number is on the snake.
15:06 for me. I immediately forgot about the negative constraint, which obviously didn't help lmao. I did enjoy it a lot in the end, fantastic puzzle!!
It's weird that the rules don't say the snake has to visit every box...because I can draw a 5 cell long snake that meets the rules, and call it job done. So I assume "Must visit every box" is an unsaid rule?
@@easternbrown That sentence does not necessarily imply that the snake must go through every box - but merely that each box it does visit includes its box number on the snake.
@@dan7845 I disagree, they don't say "within each box which the snake passes through" (similar to the preceding sentence) so each means all boxes in the puzzle and it is a mistake to imagine it does not. Otherwise why not take the laws about black dots as referring only to black dots which are on the snake also, because it is not specified otherwise?
@@dan7845 If you compare the wording with Simon's puzzle from the following day (2024-07-17), the rules there say "If the snake passes through box N, then the digit N must be part of the snake in that box" ... here there's no "if" but just a simple statement that the digit of the box number *is* on the snake.
17:54, should have solved this faster. Took me too long to get to bishop coloring. And for anybody who doesn't understand, along the snake, any number any number of bishop moves away from an odd digit is odd. Any number any number of bishop moves away from an even number is even. This gives some cells that absolutely cannot be snake.
"Within each box, the box number (1=top left, 2=top center, 3=top right, etc)...” That's just confirming the standard way of numbering boxes. Box 1 is the top left box, box 2 is the top center box, etc.
Hello, Lithium-Ion here. Many thanks for the feature and the kind words. Mark pretty much followed the intended solve path and spotted the break-in in Box 1 incredibly fast. Thanks Mark for your ongoing enthusiasm for Sudoku puzzles and clearly describing the checkerboard logic and how to apply it to this puzzle. The only thing that would have simplified something even more, would be the 48 pair in R3C8/R3C9 😉 So have fun with this puzzle and don't let the black mamba bite you!
Brilliant puzzle! I was able to solve it without any help yet it never felt 'too easy'!
I started solving at the same time I started watching the video (which gives me a bit of a head start).
Sometimes I observe Simon or Mark follow the exact same solve path as me, but not tonight. I finalized the snake cells in boxes 5/6/8/9 before boxes 1/2/3. I think it helped that I noticed the even/odd thing earlier than Mark did. The logic was very interesting in my solve path, but distinctively different than Mark's.
So, it seems that there are multiple ways to solve this one. Either way is great fun! Thank you for the puzzle!
24:11 I loved the negative constraint in this one!
How do we know the snake has to visit every box?
The box number is part of the snake. 9 Boxes 1 - 9. I think 😊
"Within each box, the box number is part of the snake"
That is only possible if the snake visits every box.
Simon's puzzle today (2024-07-17) has a variation on that rule that explicitly says that _if_ the snake visits box N _then_ the digit N must be on the snake in that box - the variation on the wording is key.
I finished in 39:47 minutes. This was a fun ruleset and puzzle. I had forgotten that the pathway was in clock type pattern and wrongly assumed that it must go counter-clockwise, before seeing that it broke in box 6, unable to get into box 5. The negative constraint is so powerful and quite enjoyable in this sudoku. Great Puzzle!
This puzzle was both more difficult and easier than I expected 😅. It was one of the more unusual snake puzzles I've done, but I really enjoyed it
Mark Goodliffe has the so called "Mamba Mentality". The Black Mamba, found on the African Savanna, is the world's most feared snake, not because it has the most poisonous venom (That Crown belongs to the Golden Lance-Head Pit Viper), but rather because the Black Mamba strikes without provocation...! You don't see it coming, and then BOOM, it's too late...! Long Live Mark Goodliffe...!
43:41 - Another very enjoyable snake puzzle. I worked out the bishops move trick early on which was hugely beneficial.
Great puzzle, the start was very hard as I misread/misunderstood the rules, but was simple afterwards, flowed nicely...very enjoyable
I usually shy away from snake puzzles (though I have no particular problem with snakes themselves), but this one looks ... doable. Especially if I were to have the video at hand to help me make my way through the tufts of grass, Mark. Thanks for this, very fun!
19:09 for me! I was shocked that I did it in so much less time than Mark-that doesn't happen every day for me.
Lovely break in and snake puzzles are my favourite. Negative constraints are tough to keep in mind but it was integral for this puzzle everywhere, each time I used it it was satisfying 🤠
I love negative constraints that are thoroughly significant to the solve path of a puzzle
@@skiesofarcadia4885 Yeah definitely! It helps keeping it in mind when you are using it constantly too
Surprised Mark solved this without identifying the 48 pair in box 3. Still a nice solve even if he made it more difficult for himself than needed.
Nice puzzle, once I figured out that "along" meant "on" and not "to either side of".
Rules not clear enough - does not explicitly say the snake passes through every box.
"Within each box, the box number is part of the snake". Within each box suggests the snake is in every box.
15:18
Incredibly I remembered the negative constraint throughout for the first time ever, I think. That with the initial box 1 deduction does yeoman's work in locating the mamba, and its number friends.
17:39 for me and somehow i managed to miss that negative constraint so lost bit time for that till i noticed it
35:42 for me, once I spotted the breakin, it was mostly smooth sailing, though did manage to mess up once after.
Some kind of visual illusion turning peripheral dots into ovals! Or is it just me??
Random thoughts:
A *line* "moves" through the center of cells...
A *1-cell wide snake* "moves" from cell to cell...
A *train* travels along a 1.4 m wide railway...
I remember having a similar thought. How does a one-cell wide snake travel through the centre of cells?
Passing through the centre of cells is usually reserved for loop lines.
@RichSmith77 Thanks for replying. I think most people do not mind about improper terminology, as long as they can understand what's the intended meaning.
Finished in 41:41. I totally forgot about the negative constraint rule until after mulling for a good 20-25 minutes the break-in. Once I remembered the negative constraint, everything else flowed.
Fun puzzle!
Good snake puzzle great solve 🐍
I was screaming about the 48 pair in box 3
Wonderful puzzle. 34:26 for me... not as slow as usual.
40:33 for me, and felt rather fast after I took quite a while for the break-in!
What a great puzzle. This one took me just over 25 minutes. Interestingly, I took a different solve path to Mark as once I’d seen the trick with 1 in box 1, the thing that struck me as most constrained was how to go through 2 in box 2. I think that approach made it a bit quicker as more of the bottom is disambiguated by the time you’re considering the snake’s path?
Either way, I thoroughly enjoyed this one! 😊
I totally forgot about the negative constraint, and so was extremely confused at the end :D
That was fun and for once I didn’t forget the negative constraint. I did have trouble spotting the last one that helped finish the puzzle.
Rules: 01:57
Let's Get Cracking: 03:43
And how about this video's Simarkisms?!
Snake: 85x (00:32, 01:03, 01:07, 01:18, 02:05, 02:15, 02:28, 02:34, 03:01, 04:16, 04:19, 04:40, 04:57, 04:57, 05:06, 05:55, 06:16, 06:20, 07:29, 07:31, 07:35, 08:26, 08:28, 08:31, 08:55, 09:55, 11:12, 11:25, 12:07, 12:16, 12:16, 12:21, 12:34, 12:56, 13:16, 13:20, 13:38, 14:05, 14:49, 15:48, 16:07, 17:07, 18:10, 18:57, 19:35, 19:38, 21:23, 21:36, 21:55, 21:59, 22:19, 22:24, 22:45, 22:47, 22:51, 23:11, 24:13, 26:54, 27:11, 27:34, 28:06, 28:34, 29:31, 30:06, 30:12, 30:29, 30:36, 30:55, 31:58, 32:07, 32:46, 32:56, 33:49, 33:56, 33:56, 33:56, 33:58, 34:14, 34:33, 35:17, 36:22, 36:58, 37:11, 38:35, 38:40)
By Sudoku: 14x (11:17, 11:42, 11:47, 12:05, 15:21, 23:26, 24:59, 25:24, 30:26, 32:41, 33:09, 34:52, 35:26, 36:07)
Checkerboard: 6x (22:14, 25:49, 26:03, 26:33, 29:20, 29:25)
Ah: 6x (10:48, 13:10, 17:38, 18:10, 27:18, 33:47)
Stuck: 4x (03:31, 11:55, 20:19, 20:23)
Touch Itself: 4x (02:19, 08:28, 11:59, 28:06)
Brilliant: 4x (00:55, 01:25, 39:05, 39:43)
Wow: 4x (03:47, 23:57, 30:36, 38:01)
Pencil Mark/mark: 3x (15:41, 31:17, 31:22)
Weird: 3x (07:53, 09:48, 31:17)
Sorry: 2x (07:43, 08:22)
In Fact: 2x (12:02, 13:44)
Obviously: 2x (01:51, 14:38)
Goodness: 1x (07:40)
Bother: 1x (17:57)
Deadly Pattern: 1x (20:52)
Approachable: 1x (01:22)
Surely: 1x (34:26)
Progress: 1x (30:55)
That's Huge: 1x (38:01)
Uniqueness: 1x (31:49)
Unique: 1x (32:01)
Most popular number(>9), digit, colour and box this video:
Forty Eight (12 mentions)
Two (75 mentions)
Black (43 mentions)
Box 3, Box 6 (2 mentions)
Antithesis Battles:
Even (5) - Odd (1)
Black (43) - White (0)
Column (5) - Row (3)
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!
Very nice puzzle
I would probably never finish this if I didn't watch how Mark started the puzzle. For some reasons my brain didn't register the rule that requires you to include the box number in the snake too and somehow interpreted it just as the snake must pass through every box. Even when i was watching Mark, I was still confused like where did Mark get the rule from? Why 1? lmao.
1:06:24 kinda tough keeping all of the rules in your head at once but I found a pretty cool labeling system that helped a lot
Snek is frend
No step on snek 🐍
Solved in 41:05. The first half I spent figuring out how to start, but then it was fun.
I remembered the negative constraint rule and somehow managed to forget we were told the snake ends in box 9! Doh!!
I treated it as if it had to start in box 5 and, since it needed to visit every box, I determined it had to end in a corner box. (Which I now realise was another error because there's no reason the snake couldn't revisit a box). Somehow I still reached the same solution. 😂
Thank you from Moscow!
Subscribed.
I'd much rather this Black Mamba puzzle solve have been published on August 24. Perhaps I save it for that day...
38:58 for me
nice puzzle
21:35 for me. Pretty proud !
At around 15:09, why must the seven be in r7c3 and not in r8c3 or r9c3 with r7c3 being a five? AHA, I forgot therule that the box number is on the snake.
Does the snake have to visit every box?
the box number has to be on the snake in each box, so yes
15:06 for me. I immediately forgot about the negative constraint, which obviously didn't help lmao. I did enjoy it a lot in the end, fantastic puzzle!!
It's weird that the rules don't say the snake has to visit every box...because I can draw a 5 cell long snake that meets the rules, and call it job done.
So I assume "Must visit every box" is an unsaid rule?
"Within each box, the box number is part of the snake" includes all boxes from 1 to 9
@@easternbrown That sentence does not necessarily imply that the snake must go through every box - but merely that each box it does visit includes its box number on the snake.
@@dan7845 I disagree, they don't say "within each box which the snake passes through" (similar to the preceding sentence) so each means all boxes in the puzzle and it is a mistake to imagine it does not. Otherwise why not take the laws about black dots as referring only to black dots which are on the snake also, because it is not specified otherwise?
@@dan7845 If you compare the wording with Simon's puzzle from the following day (2024-07-17), the rules there say "If the snake passes through box N, then the digit N must be part of the snake in that box" ... here there's no "if" but just a simple statement that the digit of the box number *is* on the snake.
22:07 for me
You could use black and white checkers like you use the chess knight as a reminder (lol). fun vid
17:54, should have solved this faster. Took me too long to get to bishop coloring. And for anybody who doesn't understand, along the snake, any number any number of bishop moves away from an odd digit is odd. Any number any number of bishop moves away from an even number is even. This gives some cells that absolutely cannot be snake.
The rules say that within box 1 the box number (=top left) has to be part of the snake... I think that's confusing.
"Within each box, the box number (1=top left, 2=top center, 3=top right, etc)...” That's just confirming the standard way of numbering boxes. Box 1 is the top left box, box 2 is the top center box, etc.
@@RichSmith77 The standard way of numbering boxes: top left=1, top center=2, etc.
@@diederikvandedijk Yes.
01:26:47
Aespa fans will be pointing at this and going HEY WAIT A MINUTE...... anyways I finished this in 30 minutes!
Not me thinking "ma ma ma mamba" 😂
@@anaayoung9142 Su-su-su-su-do-ku 😂😂 (sorry)
@@warren_r This one was genious! I'ma get them! 😆
❤