Excellent Vacuuming
(Published on 4. May 2024, 03:31 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 V sum to 5. Cells separated by an X sum to 10
- Every X and V lies on the border between the shaded and unshaded regions.
Play on SudokuPad
Puzzles in this series
Solution code: Column 1 then row 9, no spaces, 18 digits
Comments
on 31. January 2026, 19:12 by timotab
updated list of related puzzles
on 4. December 2025, 05:46 by MysticMan
Lovely puzzle!
on 19. September 2025, 10:54 by Snookerfan
Indeed excellent! Thank you
on 1. October 2024, 13:52 by Bankey
Addictive fun! Thanks, @ timotab :).
on 18. May 2024, 06:49 by yttrio
Yet another really fun entry to this series! The change to XV clues allowed for some new interesting logic.
on 16. May 2024, 20:10 by timotab
Updated series list
on 16. May 2024, 19:53 by ChinStrap
My favorite in the series. Some lovely yin yang logic to be done here.
on 5. May 2024, 12:04 by Franjo
Indeed this is an excellent construction with a delightful solving path full of nice deductions. Thank you so much for sharing.
on 5. May 2024, 05:29 by LehanLehan
Very cute steps,smooth logic,beautiful puzzle, thank you very much.
on 4. May 2024, 06:03 by fajoogaloo
Fun puzzle! Very cool how this mix of rules interact. I love how smooth it seemed deducing the killer cage totals entirely based off the yin yang geometry :)
