Shiroku

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Rules and example
  • Divide the grid into regions of 4 or 6 cells.
  • The number in a cell indicates how many of its 4 sides are region borders (grid edge included).
  • Regions of 6 cells must contain exactly 2 numbers. Regions of 4 cells must contain exactly 1.
Shiroku puzzleSolution of Shiroku puzzle

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Solution Shiroku