Dec 21, 2006


[from nikoli website]

  1. You cannot fill the cells containing numbers.
  2. A number tells the number of continuous white cells. Each area of white cells contains only one number in it and areas are separated by black cells.
  3. The black cells are linked to be an orthogonally continuous wall.
  4. Black cells cannot be linked to be 2x2 square or larger.

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