Rules (taken from Nikoli):
- Place light bulbs (circles) according to the following rules.
- Light bulbs may be placed in any of the white squares, the number in the square shows how many light bulbs are next to it, vertically and horizontally.
- Each light bulb illuminates from bulb to black square or outer frame in its row and column.
- Every white square must be illuminated and a light bulb can not illuminate another light bulb.
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$\begingroup$ Does an empty black square mean that any number of light bulbs may be next to it? $\endgroup$– Weather VaneMar 22, 2020 at 12:50
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$\begingroup$ @WeatherVane that's correct, empty black square may adjacent to any number of light bulbs. $\endgroup$– athinMar 22, 2020 at 12:57
1 Answer
First fill in the obvious ones
Continue as follows
Continue
Continue by identifying where bulbs can't be
Continue
And Finally