Normal sudoku rules apply (fill each row, column, and 3x3 box with the digits 1-9 once each).
Kropki dots: Digits in cells separated by a black dot have a 1:2 ratio. Not all dots are necessarily given.
Cages: the sum of the digits inside each cage is equal to the small number in the top left corner.
Thermometers: digits on thermometers increase from the bulb.
German whispers: along the green line, digits differ from their neighbors by at least 5.
Arrows: the sum of the digits along an arrow is equal to the digit in the connected circle.
Quadruple circles: a digit inside a white circle appears in at least one of the four cells surrounding that circle. Since the "7" in this circle appears twice, the 7 must appear at least twice in the surrounding 4 squares.
Solution code: row 5
on 31. October 2025, 22:03 by Myfyr MJ
Very nice puzzle.
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