Rules of Nurikabe puzzle

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Rules of Nurikabe (Flash)

Rules of Nurikabe (Text)

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