Sack Lunch (chaos construction)
(Eingestellt am 13. Januar 2025, 18:38 Uhr von jwsinclair)
Sack Lunch, by James Sinclair
Divide the grid into nine orthogonally-connected nine-cell regions, and place the digits 1-9 once in each row, column, and region.
The sum of the digits along an arrow is equal to the digit in the connected circle. Arrows do not cross region borders (i.e. a circle and all cells on all connected arrows must be part of the same region).
A digit in a circle (including an arrow circle) indicates the total number of cells in the same region that can be seen orthogonally, including itself.
Edit: to clarify, region borders block vision.
Play online
This puzzle originally appeared as a bonus puzzle in Artisanal Sudoku, Volume 157, along with a very easy 6x6 with the same ruleset.
Lösungscode: row five, with a dash ("-") to indicate each region border
Kommentare
am 5. Februar 2025, 00:31 Uhr von stickx
One of my favourite puzzles. <3
am 31. Januar 2025, 20:11 Uhr von Jensa
Brilliant!
am 20. Januar 2025, 13:37 Uhr von Grecolons
One of the best Chaos I've ver done. Glad I got an "early-access" by being subscribed to your substack.
am 18. Januar 2025, 00:17 Uhr von Voidslime
Loved it!
am 17. Januar 2025, 14:39 Uhr von fitzie
this was closer to a 3 for me, not for difficulty, but for time. such a wonderful puzzle.
am 17. Januar 2025, 10:38 Uhr von puzzlepandit
Enjoyed this. The break-in, flow everything is smooth.
am 16. Januar 2025, 23:03 Uhr von dzamie
I was confused as to why the puzzle links were purple. Glad to see this puzzle again!
am 16. Januar 2025, 17:35 Uhr von jwsinclair
edited to add rule clarification
am 16. Januar 2025, 06:44 Uhr von konjecture
I enjoyed this a lot - any puzzle that involves lots of colouring is great in my book.
My only issue is that the rule about digits in circles isn't clear to me. It seems based on the puzzle itself that 'seeing' is a contiguous ability. Example of what I mean (while trying to be as spoiler-free as possible): R3C1 is N and not N+1 regardless of what happens further in R3 or C1.
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Not totally sure if this addresses your point, but cells can't be "seen" through region borders (e.g. if r3c1 and r3c3 are in the same region but r3c2 isn't, r3c3 isn't included in r3c1's count). I think this is typical for rulesets like this, but I should've clarified from the start.
am 16. Januar 2025, 00:45 Uhr von sacklunch
Wonderful puzzle! Very fun, and a great namesake :)
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Haha, thanks :)
am 15. Januar 2025, 19:58 Uhr von Godrick
This was just pure fun. Very smooth solve and lot of nice logic. Thanks!
am 15. Januar 2025, 10:50 Uhr von nunc
Thanks for sharing this amazing puzzle!
am 15. Januar 2025, 08:32 Uhr von Playmaker6174
Great fun time, even for an approachable CC puzzle x)
am 15. Januar 2025, 00:49 Uhr von dustpan
Very nice! I really enjoy CC, but a lot of them tend to be 4-5 stars so I appreciate the light fare you've offered.
am 14. Januar 2025, 19:17 Uhr von MSDOS
Really clean ruleset, great flow in the solve. Wonderful chaos construction! Thanks James!
am 14. Januar 2025, 17:00 Uhr von MCMCHammer
Enjoyed that puzzle (and the 6x6 mini), a nice ruleset and challenging but not super difficult.
am 14. Januar 2025, 15:55 Uhr von Montikulum
Pleasing and invigorating as always. Cute break-in as well.
am 14. Januar 2025, 15:36 Uhr von GeorgeTheToad2
Thank you James Sinclair for an easier CC but still challenging and exciting at the same time.
am 14. Januar 2025, 13:20 Uhr von Franjo
A perfect introduction for all of you who haven’t yet tried to solve a CC-puzzle! And a wonderful exercise for the others… Thank you, J. S.
am 14. Januar 2025, 10:21 Uhr von Myxo
I didn't know a CC this easy was possible to set without making it overclued or trivial. Truly impressive!
am 14. Januar 2025, 09:17 Uhr von VitP
very nice
am 14. Januar 2025, 03:41 Uhr von MaizeGator
I've been solving some very difficult puzzles lately, which are nice, but there is something so refreshing about an approachable CC.
am 14. Januar 2025, 02:44 Uhr von Big Tiger
First: Very nice! I broke it more times than I can count but was having so much fun I was determined to get it. I may even run overdue on a client project because of it.
Second ... your solution code has two solutions. The puzzle solution is singular but the code for proving it here could be either of two ways.
EDIT: Nope, correction, I see it. The "trouble" is you don't need to solve every single border line to get all the digits in place. Doesn't matter, it was a TON OF FUN and highly recommended.
am 14. Januar 2025, 02:24 Uhr von cg24
my first CC! thank you so much for this lovely puzzle :)
am 14. Januar 2025, 02:08 Uhr von tallcat
Very good intro level CC
am 13. Januar 2025, 21:57 Uhr von wuc
Awesome cc puzzle. Typically very hard is this one approachable but still great fun. Great setting thx.
am 13. Januar 2025, 21:17 Uhr von Chaka
Very beautiful logic, very nice flow, very rewarding solve! Simply a very good setting, thank you!
am 13. Januar 2025, 20:48 Uhr von OGRussHood
A deliciously fun sudoku!
am 13. Januar 2025, 20:06 Uhr von mathpesto
Impressively approachable chaos construction!
