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Kropki Sudoku (48)

Instruction:
Apply classic sudoku rules. Adjacent cells containing digits whose difference is 1 are marked with a white circle. Adjacent cells containing digits whose ratio is 2 are marked with a black circle. Adjacent cells with no marking must not contain digits either whose difference is 1 or whose ratio is 2.

Reference: WPF (1)

Examples:
WPF Sudoku GP 2014 - Round 2 (113)
WPF Sudoku GP 2016 - Round 2 (99)
WPF Sudoku GP 2016 - Round 4 (101)
WPF Sudoku GP 2017 - Round 8 (9)
WPF Sudoku GP 2021 - Round 5 (161)
Parent puzzle:
Sudoku

Child puzzles:
Delimited Kropki Sudoku
Double Kropki Sudoku
Related puzzles:
Kropki