Budowa (Chaos Construction, Kreska)
(Published on 4. January 2026, 12:00 by Crusader175)
Rules:
Chaos Construction: Divide the grid into regions of 9 orthogonally connected cells each, such that every cell is part of exactly one region. Place the digits 1-9 exactly once in each row, column and region.
Kreska: Adjacent digits along a line must either be consecutive and belong to a different region or have a 1:2 ratio and belong to the same region. If 1 and 2 are adjacent along a line, they can satisfy either condition.
Puzzle Link: SudokuPad
My youtube channel on solving sudoku: Crusader Puzzle
Solution code: Row 8, with a dash (-) to represent region borders
Comments
on 12. January 2026, 03:10 by War
Beautiful puzzle, first 6 rows were excellent fun, the rest resolved like a typical chaos construction. Very fun ruleset, not too tough once you learn the "trick"
on 9. January 2026, 02:18 by MikeMeech
Wow! This was one of my favourites ever.
on 8. January 2026, 14:36 by virus_dave
What a fun and challenging puzzle! Very clever.
on 8. January 2026, 11:18 by KNT
really nice!
on 7. January 2026, 23:43 by damo_89
Lovely! Very easy to make a mistake especially at the beginning where the regions seem so unconstrained, but after a certain point the chaos construction just works its magic and it is easy slopes right to the bottom.
on 6. January 2026, 23:09 by Voidslime
4* break in but then i agree the rest flows so smoothly and satisfyingly at around 2* toughness
on 6. January 2026, 21:02 by thoughtbyte
Phenomenal puzzle with fresh, very fun logic. Thanks!
on 6. January 2026, 06:17 by sniffingstuffs
Loved this puzzle! I loved how the two rulesets interact with each other so smoothly. Though I wonder what is the intended way to figure out the four cell Kreska, since I solved it in kind of a clunky way.
Reply: I'll put the explanation in the hidden comment. Thank you for solving!
on 5. January 2026, 21:23 by marcmees
Staring at this puzzle for a while before the rules kick in. Then it solves rather smooth, surprisingly so in the clueless bottom rows as well. Bravo. Thanks
Reply: I try to make sure that the endgame is smooth, so that's glad to hear. Thanks marcmees!
on 5. January 2026, 14:53 by Franjo
Wow! Thank you very much for creating and sharing this brilliant CC-puzzle.
Reply: Thank you for the solve and kind comment Franjo!
on 4. January 2026, 15:18 by AKernel
Great puzzle. Big thumbs up!
Reply: Glad you like it! Thanks AKernel!
on 4. January 2026, 14:08 by Snookerfan
Great puzzle! Tough ruleset, but very rewarding solve. Thanks
Reply: Took me a some time too when I solve my first kreska. Thank you Snookerfan!
on 4. January 2026, 13:24 by Gilliatt
Just for clarification, e.g. R1C1, R1C2 and R1C3 belonging to the same line, should R1C1 v.s. R1C2 and R1C2 v.s. R1C3 follow the same Kreska rule? I.e. is it allowed that R1C1 and R1C2 are consecutive and belong to different region, while R1C2 and R1C3 have 1:2 ratio and belong to the same region? Thanks!
Reply: Yes it's allowed. So you need to determined the condition for each adjacent digits.
on 4. January 2026, 13:21 by Playmaker6174
Wonderful setting! A couple of tricky bits at first, but then it resolved rather smoothly till the end and I was in awe of how it all came together towards the end too, quite a crazy achievement there xD
Reply: Thank you for the test solve help Playmaker!
