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Akari (Diagonal Clues) (1074)
Instruction:
Locate some "light bulbs" in the grid such that every white cell is "lit up". Each bulb occupies a single white cell, and lights up its own cell, as well as white cells in the four orthogonal directions until the light beam encounters a black square or the edge of the grid. A bulb may not illuminate another light bulb. All white cells must be lit up by at least one bulb.
A given number in a black cell indicates how many cells diagonally (not orthogonally) adjacent to it are occupied by bulbs.