747 Take-off
(Published on 19. August 2026, 20:37 by sujoyku)
Rules:
- Chaos Construction: Divide the grid into seven orthogonally connected seven-cell regions, and place the digits 1-7 once in each row, column, and region.
- Circles: The four cells around an circle must either all belong to one region or all belong to different regions.
- Target Sums: A clue X outside the grid indicates the sum of all the digits that appear in its row or column before reaching the target digit X (starting from the end with the clue).
Example: A row with a Target Sums clue of 5 could read 2351647, as the digits 2 and 3 that appear before reaching 5 sum to 5.
- Indicated Region Borders: For each outside clue, the digits in the sum must belong to the same region and the digit X must belong to a different region.
Here you can solve the puzzle online:
Solution code: Row 5 from left to right with the symbol "/" marking borders between regions (for example 12/345/67)
Comments
on 30. August 2026, 17:51 by Lenivaya_Joppa
Thank you for this nice puzzle, dear sujoyku! It is a really good puzzle to get used to the Chaos Construction! :)
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Thank you for your comment, Lenivaya_Joppa! It is great to hear that you think this is a good intro to CCs.
Kind regards, sujoyku
on 26. August 2026, 11:06 by Sherif
It's fun, 1* difficulty
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Thank you, Sherif! I am glad you had a fun solve.
Kind regards, sujoyku
on 24. August 2026, 12:49 by mscha
Very nice and accessible puzzle! I gave it 2 stars, though, I found it (just) too tricky for a 1 star puzzle. (Even though I had just finished Accuracy, which certainly helped for this one.)
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Thank you for your comment, mscha! I am glad that you liked the puzzle. I agree with your assessment, I also think it is rather 2* (as which I initially posted), but the borders between tougher 1* and easy 2* might be fluent anyways. Thanks again for giving your feedback!
Kind regards, sujoyku
on 21. August 2026, 15:27 by amchap
Lovely approachable target sums. Thanks for sharing.
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You are much welcome, amchap, thank you for commenting! Great to hear you enjoyed the Target Sums constraint.
Kind regards, sujoyku
on 21. August 2026, 03:08 by cygne
Gorgeous puzzle! Kudos
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Thank you, cygne!
Kind regards, sujoyku
on 20. August 2026, 20:18 by firespire
Had the magic words "approachable" I loved it.
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Thank you, firespire! I am glad you liked it.
Kind regards, sujoyku
on 20. August 2026, 17:08 by Franjo
DAS war wirklich sehr leicht. Und schön. Vielen Dank dafür.
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Sehr gern geschehen, Franjo, vielen Dank für deinen Kommentar! Es freut mich, dass es Dir gefallen hat.
Herzliche Grüße, sujoyku
on 20. August 2026, 16:57 by Prince Myshkin
Loved it! Thanks, Sujoyku!
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You are much welcome, Prince Myshkin, thank you for your comment! I am glad that you enjoyed it.
Kind regards, sujoyku
on 20. August 2026, 13:59 by JVA
36:30 minutes to solve. Not the easiest Chaos Construction puzzle I've solved, felt too tricky to be GAS. The CC puzzle with target sums from Prof.Dori was definitely easier
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Thank you for your comment, JVA! I did not mean to imply this was very easy, just thought it was more approachable than my first two CCs (which turned out to be 3*s). To be honest, I am surprised this got rated 1*, initially I uploaded it at 2.
Kind regards, sujoyku
on 19. August 2026, 22:57 by GeorgeTheToad2
Enjoyed this new target constraint especially in a 7 by 7. Great puzzle just before bedtime.
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Thank you for your comment, GeorgeTheToad2! I am glad that you enjoyed it as a little puzzle snack before bedtime. I am also curious how this constraint will do in 9x9. With its limited "range", it works really well in smaller grids.
Kind regards, sujoyku
on 19. August 2026, 22:35 by Anthony
I've been really loving this target sums constraint, from the few puzzles I've played with it. This one is no different. A very fun solve.
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Thank you, Anthony! It is great to hear you had a fun solve.
Kind regards, sujoyku
on 19. August 2026, 22:31 by TimBoPavey
Lovely solve. Thank you sujoyku.
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You are much welcome, TimBoPavey, thank you for commenting! I am glad you enjoyed the solve.
Kind regards, sujoyku
on 19. August 2026, 22:18 by Christounet
Nice twist of the X-sum ruleset! Thanks :)
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You are much welcome, Christounet, thank you for your comment! I quickly began to like the constraint when Dorlir explained it to me first. :)
Kind regards, sujoyku
on 19. August 2026, 22:06 by DanishDynamite
Lovely. And quite approachable.
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Thank you for your comment, DanishDynamite! I am glad that you liked the puzzle and found it to be approachable.
Kind regards, sujoyku
