Recycling Centre
(Published on 28. April 2024, 01:30 by timotab)
- Normal Sudoku rules apply
- Yin-Yang: Shade some cells such that all shaded cells are orthogonally connected and all unshaded cells are orthogonally connected. No 2x2 area is fully shaded or unshaded.
- Digits may not repeat in cages, and must sum to the value in the top left corner of the cage, if given.
- Cage totals indicate how many cells of the same colour (shaded or unshaded) are seen orthogonally from the position of the cell marked with a diamond in that cage, including itself. The 'other' colour blocks vision.
- Cells separated by a white dot are consecutive. Cells separated by a black dot are in a 1:2 ratio
- All dots lie on the border between the shaded and unshaded regions.
Play on SudokuPad
Puzzles in this series
Solution code: Column 8 then Row 3. 18 digits, no spaces.
Comments
on 22. September 2025, 05:58 by VitP
there are a number of claims that this puzzle is "easier than the others".
those claims seem to be refuted by basic facts.
1) puzzle 1: you can immediately identify both edge transitions.
puzzle 2: there is a 10 cage on the edge, and other strong clues, so you can make great progress immediately.
puzzle 3: nothing comparable exists.
the break-in, once you find it, is easy enough, and the solution flows smoothly after that, but, because it is in exactly the LAST place you will look, the puzzle difficulty is on the hard side of level 3.
(it goes without saying that you need to be experienced with BOTH standard yy procedures AND the counting cage subvariant.)
on 19. September 2025, 11:20 by Snookerfan
A bit easier than the others in the brilliant series and very entertaining, thank you!
on 29. May 2024, 16:06 by Blobz
Another nice break-in. The diamond/cage constraints work really well with Yin Yang. Great puzzle.
on 16. May 2024, 20:09 by timotab
Updated series list
on 16. May 2024, 18:58 by ChinStrap
Agreed with the other comments. Flowed super nice but felt a little easier (but could be because I've done the first two before this)
on 13. May 2024, 13:02 by mihel111
+1 to yttrio's comment. The challenge is now to make a puzzle with a bit lesser dots and cages. Come on timotab, keep the good work going on.
on 29. April 2024, 12:28 by zrbakhtiar
absolutely loving this series. love yin yang and this particular mix with killer cage is superb!
on 29. April 2024, 06:47 by timotab
Tidied up rules
on 28. April 2024, 19:58 by yttrio
Maybe my brain has now just gotten a bit more used to this rule set, but this one felt particularly smooth to solve. For me, all the deductions flowed really well!
on 28. April 2024, 14:45 by DanishDynamite
Love this constraint! Keep them coming.
on 28. April 2024, 14:26 by chis_r
Great setting - was challenging at times but there was always a way to progress! Thanks!
