Shakashaka is a binary determination puzzle in which the cells in a grid are left unshaded or half-shaded into triangles.


The objective is to divide the grid into unshaded rectangles subject to the following rules:

  1. No two rectangles can share an edge.
  2. Cells can only be half-shaded into triangles, or left unshaded.
  3. Numbers in some cells denote the number of edges it shares with the shaded triangles.


Shakashaka Example
Shakashaka Solution

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