Normal sudoku rules apply.
Orthogonally adjacent cells can not sum to 5 or 10.
Two lines of the same length and same color are connected X lines.
Counting from the bulb, the first cell of each connected X line sum to 10. the second cell of each line sum to 10 etc.
There is a 3x3 magic square somewhere in the grid.
(A magic square is a 3x3 square with the digits 1-9 where all rows, columns and diagonals have the same sum)
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Bless you!
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Example
Lösungscode: give the digits of column 1 (top to bottom)
Heute, 04:03 Uhr von TroublesomeOrca
Sorted - thanks very much NurglesGift! An excellent puzzle again.
Now to go through that initial solution....
Gestern, 12:40 Uhr von NurglesGift
Well the constrains is not only on the lines. Your first and third digits should be -2. The rest I think you can figure out
Gestern, 09:52 Uhr von TroublesomeOrca
Yup - reloaded the solved puzzle, it came up solution checked and yet column 1 doesn't work. A quick visual check of X's, V's and the lines doesn't show an error... I'll put my column 1 as a hidden comment (lol - although I won't be able to see it!). Can you check against yours, please?
am 9. September 2025, 15:21 Uhr von NurglesGift
yes column 1
am 18. August 2025, 15:30 Uhr von NurglesGift
yes, copy mistake on my part
am 18. August 2025, 14:19 Uhr von Villse
Is there a negative restraint on the black dots? (rule listed in sudokupad but not here)
Edit: Got my head out of my ass and managed to solve whitout any black dot rule so I suspect it's just a missprint in the rules :)