This puzzle appears to be a Nikoli original.
Puzzle and Goal
An unsolved puzzle consists of a rectangular (typically square) grid. Some of the cells have been blackened, and some of <em>those</em> cells contain digits from 0 to 4.
The goal is to place virtual light bulbs in some of the cells to satisfy the clues.
The solved grid must satisfy the following conditions:
Each white cell is lit up by at least one light bulb; that is, each white cell is in the same rank as a light bulb, with no intervening blackened cells.
No light bulb is lit up by another one.
The numbered clues indicate the number of orthogonal neighbors containing light bulbs.
Beleuchtung; Bijutsukan; Galerie; Gebäudesicherung; Gebäudeüberwachung; Light Up