Rules

  • Place a digit from 1 to 6 in each of the empty cells so that each digit appears exactly once in each row, column and outlined region.

  • 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.

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