Kropki Sudoku

The digits in adjacent cells with Hollow dot must be consecutive and the digits in adjacent cells with solid dot between them have a ratio of 2:1. Adjacent cells with no dots have no restrictions.

Kropki is a highly entertaining variant. The board contains two types small dots, Hollow and Solid. The dots are placed between two adjacent cells on the board. See image. Kropki rules below the image. Kropki

Kropki rules:

  1. A Solid dot: the cell on one side of the dot must be twice the value of the cell on the other side of the dot, e.g.: (1&2) ,(2&4).
  2. A Hollow dot: the digits on both sides of the dot must be consecutive, e.g: (1&2),(2&3),(3&4).

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