Akari

Akari (Light Up, Lightbulbs, Bulbs) is a logic puzzle. Place lights in such a way that all cells are illuminated and the lights do not shine on each other.

Rules: Place lamps in some of the white cells in such a way that all white cells are illuminated and no lamp illuminates another.
A lamp shines in all four directions until it reaches the next “lamp post” (dark cell), or the edge of the grid. A number in a dark cell indicates how many lamps are orthogonally adjacent to that cell.