1. Each number in the grid indicates a region of edge-connected cells of exactly that number. No two numbered areas can touch except at corners. Each number will be a part of exactly one region
2. Each numbered region is surrounded by either the walls of the puzzle, or black cells. All black cells must be edge-connected together to form one contiguous region.
3. No numbered cells can be painted black.
4. No black cells can be connected together to form a 2x2 area of black cells in any part of the grid.
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