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Rules -- Process of Illumination

Process of Illumination was invented by the Japanese puzzle company Nikoli (under the name Akari, FKA Light Up).

1. Place light bulbs on the white cells according to the following rules.
2. Every white cell must be illuminated by at least one light bulb. A light bulb illuminates its own cell, plus all other cells in an uninterrupted horizontal or vertical line, up to the perimeter of the puzzle, or a black cell (whichever is closer).
3. No two light bulbs may illuminate each other.
4. A number on a black cell represents how many light bulbs are on cells which share an edge with that cell.

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