Chaos Construction: Y-Sums
(Published on 2. March 2026, 17:04 by KNT)
A number outside the grid indicates that the first Y numbers looking into the grid sum to that number, where Y is the Xth number from the direction of the clue, and X is the first number from the direction of the clue. A question mark may be any positive number.
Those first Y numbers comprising the sum of the outside clue are all part of the same region, and (if Y is less than 9), the Y+1th cell is in a different region.
Furthermore, of the (up to) 9 cells surrounding and including the cell containing Y, exactly Y belong to the region containing the cell containing Y.
One number is already given.
A 6x6 example with a given border is provided:
Solution code: Row 2, Column 3
Comments
on 8. March 2026, 17:27 by cyddrdrd
Fun and smooth!
on 6. March 2026, 21:40 by War
That was fun
on 5. March 2026, 12:05 by LSYasdsa
answer is 18 digits without comma. XD
on 3. March 2026, 22:49 by Silverscree
The 6×6 was fun too!
on 3. March 2026, 15:20 by Snookerfan
Gorgeous puzzle! I had to take some time to wrap my head around the Y-sums rule. After the superb break-in, the puzzle kept challenging. Thanks
on 3. March 2026, 13:13 by Franjo
Wow! Thank you very much for creating and sharing this incredibly wonderful puzzle. Absolutely brilliant setting!
on 3. March 2026, 11:41 by Christounet
Excellent CC with a couple tricky bits but nothing too hard. Thanks :)
on 3. March 2026, 09:26 by marcmees
Extremely nice and tricky till the end. Enjoyed that. Thanks.
on 3. March 2026, 08:59 by Piatato
Excellent! Lots of fun logic throughout!
on 3. March 2026, 02:49 by Crusader175
Very fun puzzle!
on 3. March 2026, 00:21 by Jesper
A lot of fun!
on 2. March 2026, 23:41 by Allagem
What a wild break-in that somehow felt uniquely "Y-sum"-y - a thing I would not have guessed possible until I tried this puzzle. Bravo!
on 2. March 2026, 22:42 by Myxo
KNT steht wohl für "kann nicht toppen"!
on 2. March 2026, 21:25 by SirWoezel
Glorious! What a beautiful puzzle.
on 2. March 2026, 18:24 by henrypijames
First I thought the solution code is the single digit in R2C3. :D
