Phosphorous Gas
(Published on 6. August 2026, 09:30 by lgastako)
Back with another easy GAS. I hope you enjoy. As always, I welcome and encourage all feedback, positive or negative!
- Normal Sudoku Rules: Fill each row, column, and 3x3 box with the digits 1-9 once each.
- White Kropkis/Black Kropkis: Digits in cells separated by a white dot are consecutive. Digits in cells separated by a black dot have a 1:2 ratio.
- German Whispers: Along green lines, digits must differ from their neighbors by at least 5.
- Dutch Whispers: Along orange lines, digits must differ from their neighbors by at least 4.
- Renban: Purple lines contain a non-repeating set of consecutive digits in any order.
- Little Killers: Numbers outside the grid give the sum of all cells along the diagonal pointed to by the arrow.
NB. Phosphorus has five valence electrons.
Solution code: Column 9, in order, from top to bottom.
Comments
on 22. August 2026, 14:00 by lgastako
Fixed formatting of link.
on 7. August 2026, 08:21 by Martina
What do you mean by "valence electrons"? I don't get that rule.
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(lgastako): It's not so much a rule, as a hint. Along the primary solve path I intended, there's a point where I was worried solvers might get stuck and that note was intended to draw their attention to 5's at that point. Of course I watched a friend of mine solve it and he took a completely different route and was never stuck at all, so who knows if it's even useful.
on 6. August 2026, 17:07 by Rollo
Column 9 in order would be 123456789 ;-)
on 6. August 2026, 13:06 by wuc
Missed the gas 10min barrier by 8 seconds. Fun approachable puzzle thx.
on 6. August 2026, 10:50 by michael_787
Very smooth. Thank you!
on 6. August 2026, 10:35 by lgastako
Added renban constraint description.
on 6. August 2026, 10:24 by mkiesvaara
Nice puzzle! I think you are missing the renban rule
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(lgastako): Thanks for letting me know, I've updated the page and the puzzle.
