The Big Beach Parity
(Published on 3. October 2025, 14:58 by gdc)
This is a follow up to Sweeping Seas with a simpler ruleset. According to testers (thanks everyone!), the difficulty should be around 1.5-2 stars. If you are new to shading puzzles, see the example below. Hope you enjoy!
Parity Islands: Orthognally connected groups of cells with the same odd/even parity are called "islands".
Circles: A digit in a circle is odd and counts the number of cells in its island.
Squares: A digit in a square is even and counts the number of cells in its island.
Example
Cells were colored for edd/even. Islands are edge-connected groups of the same color. Circles show the size of their orange island. Not all circles/squares are given. Unclued blue islands might have an odd number of cells.
Solution code: The bottom row (row 9) left to right (9 digits).
Comments
on 5. October 2025, 12:17 by galium_odoratum
Super fun ruleset!
on 4. October 2025, 15:59 by anothermember
Nice and smooth, a harder 1* or an easier 2*. Now I want to try Sweeping Seas.
on 4. October 2025, 14:08 by IFlaig
Nice puzzle, clean solution :)
on 4. October 2025, 10:37 by Fra314
Beautiful! Smooth as oil and refreshing as water!
on 4. October 2025, 07:57 by Scorps
My first time trying this kind of colouring puzzle. Did OK once I realised an island could contain two clues - got myself in a tangle trying to keep them apart before that brainwave though. Thanks for sharing!
on 4. October 2025, 05:11 by baku
Very fun solving path. Thank you for sharing!
on 3. October 2025, 23:48 by ViKingPrime
The best parity colouring puzzle I've yet seen, which is all the more impressive as it's also likely the most approachable. Excellent setting.
on 3. October 2025, 23:47 by wuc
Great smooth fun 2* puzzle thx.
on 3. October 2025, 22:12 by Exigus
Pretty easy but still very enjoyable. Thanks!
on 3. October 2025, 16:31 by Lorena
“Well, that’s that done” - she thought to herself as she coloured the last of the 81 cells. Then she looked up and saw… a mostly empty grid, with only the squares and circles filled in. She felt a familiar dread inside her, rising unstoppably like the digits on a thermo, as she realised the inescapable truth… sometimes… sometimes… you gotta do sudoku in a sudoku puzzle.
on 3. October 2025, 16:22 by damo_89
I second what Calvinball said
on 3. October 2025, 15:16 by Calvinball
This is a great entry point if you're newer to shading puzzles and a great puzzle if you have more experience with them.
