Let there be chaos
(Published on 3. March 2026, 16:01 by rosiebye)
Divide the grid into regions of orthogonally connected cells. Place the digits 1-9 once each in every row, column, and region.
A digit in a circle indicates exactly how many circles contain that digit. A digit in a circle also indicates how many of the up-to nine surrounding cells (including itself) are in the same region as that circle.
Digits in cells separated by a white dot are consecutive. Digits in cells separated by an X sum to ten. Not all dots and X's are necessarily given.
SudokuPad
Solution code: Column 2 from top to bottom
Comments
on 25. April 2026, 20:21 by kasperd
This one took me a few attempts to get right because I erroneously concluded that there had to be a pair of circled twos, which could only be in column 1 and row 9.
on 22. April 2026, 21:09 by madhupt
Very smooth! Very enjoyable!
on 22. April 2026, 13:36 by Qodec
Brilliant! Thanks!
on 22. April 2026, 12:09 by QuiltyAsCharged
Lovely puzzle! I enjoyed reasoning through which digits would or would not end up in circles
on 17. March 2026, 17:52 by MaizeGator
Super enjoyable. Great region building up front and cool sudoku tricks in the resolution.
on 8. March 2026, 00:47 by abadx
Nice flow, fair difficulty and nice region distribution. Thanks for setting.
on 6. March 2026, 03:52 by waffles_the_dog
I really enjoyed this, thanks for setting it :D
on 3. March 2026, 20:21 by dzamie
That took quite some doing! I'm glad that there was a somewhat simple-ish digit to fill out all 9 of early on, so I could get to coloring the regions. Wound up doing some light bifurcation to finalize the last 3 cells of r9c1's region, but I suspect I missed something or didn't recognize a pattern to avoid that.
