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49. Seven by Seven

Rip old phone but then again it still kinda works

Anyways, this puzzle uses a constraint that I didn't invent, but implemented to SudokuMaker for use. And yeah it's factor lines. The black color for the lines loosely came from one of Marty Sears' fabulous Rat Run puzzles.

Creator's time: 34:12

Rules: Normal 9×9 Sudoku rules apply.

Variant 1: Factor Lines \ For every pair of adjacent digits on a black factor line, one must be a factor/multiple of the other. (Example: 4-2-6-3-9-1-7)

Variant 2: Kropki \ Digits separated by a white dot are consecutive; digits separated by a black dot have a 1:2 ratio. Not all dots are necessarily given.


Difficulty: 9.0/14

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