Akari puzzle is a kind of pencil puzzle where all cells are lit-up by placing lightbulbs and no lightbulbs shine on each other.
Rule is very simple.
1. Lightbulbs shine every cell vertically and horizontally until they reach a black cell or the boundary.
2. Numbers in some black cells denote the number of lightbulbs in adjacent cells.
3. Lightbulbs themselves are not lit by other lightbulbs.