Shikasudoku
(Published on 8. November 2021, 18:44 by Qodec)
This puzzle is a shikaku-sudoku hybrid, which is inspired by Sudokurotto by Phistomefel and Juosan Killer sudoku by udukos.
Normal sudoku rules apply. Additionally:
- Divide the grid into rectangular regions of orthogonally connected cells. Each rectangle contains exactly one circle. A single cell with a circle counts as a 1x1 rectangle.
- A number in a circle represents how many cells are in the rectangle the circle belongs to.
- Rectangles cannot overlap.
- Every cell in the grid is part of a rectangle.
- Digits may repeat in a rectangle if allowed by other rules.
Here is an example:
You can try it over here on f-puzzles: https://f-puzzles.com/?id=yeuknp9h or Penpa+: https://git.io/JXgfq.
An easier 6x6 puzzle to get familiar with some of the logic is this:
You can try it over here on f-puzzles: https://f-puzzles.com/?id=ygme6y69 or Penpa+ with answer check: https://git.io/JPxw4.
Now for the main puzzle:
Note: the initial version of this puzzle did not have the given 1 in r7c5, which allowed for additional solutions. This has now been fixed, thanks a lot to everyone who pointed it out to me immediately after they saw it! And thanks to Tristan for creating links with the fix!
You can play this puzzle online using:
- Penpa+ with answer check: https://tinyurl.com/y9ojp5fl
- CTC app: https://tinyurl.com/4uxkmku3
- f-puzzles: https://f-puzzles.com/?id=ydh9azlu
Good luck!
Solution code: Rows 2 and 8. I.e. the 9 digits in row 2 from left to right, followed by the 9 digits in row 8 from left to right, for example: 123456789123456789
Comments
on 3. November 2022, 03:24 by wooferzfg
Very fun :)
on 26. May 2022, 21:06 by Christounet
Very nice variant with the tiling part !
on 31. March 2022, 23:22 by SHERAX
Joyfully
on 31. March 2022, 20:53 by SHERAX
Joyfully
on 19. February 2022, 16:39 by Bankey
Absorbing puzzle. Thanks, @ Qodec :-)
on 13. February 2022, 16:25 by abed hawila
Very enjoyable puzzle, I liked how you crafted different logic in the two puzzles with lots of rewarding deduction. Loved the hybrid, thanks Qodec :)
on 10. February 2022, 21:02 by Qodec
Fixed puzzle by adding given digit 1 (r7c5). See note in description.
on 9. November 2021, 17:20 by henrypijames
I came to the following tiling of the grid, but the remaining sudoku has multiple solutions:
https://git.io/JXooW
I suspect my tiling is an unexpected alternative to the intended solution?
@henrypijames Oh if this were true it would make me very sad, but I thank you very much for pointing it out. I don't have the time right now to look into it, but I'll deactivate for now to see if I can or should fix it later this week. Many apologies!
on 8. November 2021, 22:27 by belfieldtj
I really enjoyed this!!
on 8. November 2021, 18:55 by Steven R
Loved this hybrid!
