an akari puzzle.
as with 460, observe that the following placements creates the dreaded L-shape:
from this, it follows that each pair of cells shown above must contain exactly one light; otherwise, one of the 2 L-shapes will be forced.
now, note that the two red pairs lie on the two red lines, and the two blue pairs lie on the two blue lines:
therefore, we can draw these Xs by line counting:
and, applying line counting again to the three blue lines shown above, we can draw Xs and determine these lights:
just keep following the flow now, and we’re done!
完成です。