Chaos Construction: diagonals
(Published on 23. May 2022, 07:00 by Prutsbeest)
Every digit from 1 to 9 appears once in every row, column and region. The 9 regions are to be determined. Every region is a set of 9 orthogonally connected cells.
Circled digits signify the number of cells it sees diagonally in its region (not including itself). Not all circles are necessarily given.
Here is a 6x6 example to illustrate the ruleset:
Link to the example puzzle: https://f-puzzles.com/?id=y6l7g4lj
And then for the actual puzzle:
Solve using F-puzzles or using the C.T.C. app
Solution code: Row 1 followed by column 6 (18 digits, no spaces)
Comments
on 19. November 2022, 19:15 by peacherwu2
Opening is not the hardest, but closing is brutal.
on 8. July 2022, 21:05 by twobear
Very nice! Quite hard after the mid-solve. Thank you!
on 19. June 2022, 02:05 by marcmees
hard but satisfying solve. thanks.
on 5. June 2022, 22:47 by Snookerfan
Very hard Sudoku in the end, for me at least! Great puzzle with an interesting rule set.
on 26. May 2022, 23:46 by filuta
such a cool puzzle with some amazing geometry, I was surprised how powerful the diagonal constraint is (in the right hands of course).
on 24. May 2022, 18:01 by Prutsbeest
Increased difficulty rating based on feedback.
Thanks LittleBallOfPurr, Jesper and wildbush7 for the nice comments! :-)
on 24. May 2022, 17:47 by wildbush7
Really enjoyed this puzzle. Was definitely more difficult than 3 stars to me.
on 23. May 2022, 19:15 by Prutsbeest
Added C.T.C. link
on 23. May 2022, 18:33 by Jesper
Very nice! Easy start, then gets a lot more intricate, but with some elegant deductions.
on 23. May 2022, 17:43 by LittleBallOfPurr
Lovely puzzle, felt a lot harder than a 3 star difficulty, to me. Gave my brain hamsters a good workout, thank-you!
on 23. May 2022, 09:49 by Prutsbeest
Update example puzzle
