Element-Sudoku Helium
(Published on 24. October 2026, 13:15 by Zinker)
The normal Sudoku rules apply: in each row, each column, and each bold-outlined 3x3 box, the digits 1–9 must each appear exactly once.
Additionally:
Green spectral lines: Adjacent digits along any green spectral line differ by at least 5.
Yellow atoms: Around an atom, all surrounding digits are either all even or all odd.
Red atomic nuclei: Around a red atomic nucleus there are always two pairs of identical digits in a cross formation (e.g., 4 4 and 9 9).
Electrons: Cells connected by a white electron contain consecutive digits. Cells connected by a black electron have a 1:2 ratio. Not all white and black electrons are given.
Sudokupad:
Sudokupad linkSolution code: Row 9
Comments
yesterday, 18:59 by Zinker
There is a new Sudokupad-Link with new description.
on 24. October 2026, 21:41 by SanFranSam
Oooh! So there is second puzzle in the puzzle. Find the missing yellow atoms. I didn't even notice the wrong rule.
on 24. October 2026, 20:28 by AlexT74_NL
Correct, 2 yellow atoms missing.
on 24. October 2026, 19:49 by fuxia
I found it very irritating that puzzle page says, all atoms are given. This clearly not the case. Please fix that.
on 24. October 2026, 16:30 by Martina
Fun solve, the rules look fine to me.
on 24. October 2026, 13:32 by JohanW
Not all atoms are given, despite what the rules say.
