Blueprints (ft. Andrewsarchus)
(Published on 14. May 2025, 09:00 by Nordy)
This puzzle was made in collaboration with Andrewsarchus, and is inspired by his puzzle Snakes of Chaos. Difficulty estimated at 4.5 stars.
Rules:
Chaos Construction: Divide the grid into orthogonally-connected regions and place the digits 0 to 8 in every row, column, and region.
Blueprints: Every cell in the grid has four edges—a top edge, bottom edge, left edge, and right edge—and each of those edges may or may not have a region border (the outermost edge of the grid is always considered a region border). A cell’s “blueprint” is the exact composition of region borders on that cell’s four edges. For example, a cell may have region borders on its top and left edges, and no region borders on its bottom and right edges.
Arrows: A digit N in a cell with an arrow indicates that N other cells have the same blueprint as that cell in the indicated direction.
Example:
Below is a 6x6 example puzzle (using the digits 0 to 5) to help illustrate the rules. You can play the example puzzle on SudokuPad here.
Solve Online:
Solution code: Row 9 with dashes for region borders (excluding the outermost edge of the grid). Ex: 012-34-567-8
Comments
on 31. August 2025, 21:08 by kmoter
wow
on 19. May 2025, 02:24 by askaksaksask
Great opener, great logic, great spiritual successor to 'Snakes of Chaos'... the resolution of the puzzle might be my favorite part, but no spoilers! Very, very fun, and really a clever puzzle. Thank you!
on 18. May 2025, 03:51 by MaizeGator
Really impressive construction
on 17. May 2025, 11:02 by GoodMorningCallum
This interesting new rule made for a challenging and really enjoyable puzzle. Superb - thank you very much!
on 15. May 2025, 18:33 by peacherwu2
Wonderful, wonderful, wonderful!
on 15. May 2025, 06:22 by marcmees
very nice. thanks
on 14. May 2025, 23:21 by Fool on Hill
Cool puzzle with some interesting variety in deductions right through to the end. So easy to go wrong …
on 14. May 2025, 17:46 by mathpesto
Absolutely incredible setting! So many lovely moments throughout.
on 14. May 2025, 15:58 by Andrewsarchus
It was a great pleasure collaborating with you!
on 14. May 2025, 13:39 by Snookerfan
Sublime ruleset and great setting leading to a smooth and fun solve! Thank you
on 14. May 2025, 12:56 by 9Rookienumbers
What an amazing construction.
on 14. May 2025, 12:47 by Calvinball
Wonderful implementation of a bonkers idea, loved it.
