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Description

Light and Shadow is a binary determination puzzle in which the cells in a grid are split into shaded and unshaded cells.

Rules

The objective is to divide the grid into shaded and unshaded cells, subject to the following rules:

  1. Each region contains one number with an area equal to that number.
  2. Numbers in white cells are part of white regions; numbers in gray cells are part of gray regions.
  3. Same colored regions cannot share an edge.

Example

A standard 10x10 light and shadow and its solution.

Light And Shadow Example
Light And Shadow Solution

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