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.
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.
F-Puzzles-Link: F-Puzzles link
Sudokupad-Link: Sudokupad link
Solution code: The first row
on 20. June 2026, 11:31 by Niveous
Really enjoyed this one - nice and relaxing once the flow starts
on 19. June 2026, 19:28 by HeyItsErin
Fun puzzle but definitely closer to a 1* difficulty.
| Difficulty: | ![]() |
| Rating: | 94 % |
| Solved: | 184 times |
| Observed: | 0 times |
| ID: | 000TD7 |