Rules: Place some light bulbs into each of the bold outlined rooms, one per cell, such that all of the cells in the grid are illuminated. Bulbs illuminate cells within their containing room only, and only those that are in the same row or column. No two bulbs may illuminate each other - two bulbs may not be placed in the same row or column within their room. Each number indicates how many bulbs are contained in the corresponding room.
About : Invented by Anurag Sahay, Interior Illumination debuts with this post.
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