an akari puzzle.
note that we cannot light these two squares as a contradiction is formed:
therefore, we must light these two:
we first light the green square because we can’t light both red squares, then we light the yellow square because we can’t light both blue squares (by the same logic as the very first step).
from here, we can do line counting twice:
the blue and green eliminate the red squares, and the 5 yellow lights lie on the 5 lines drawn.
therefore, we can light these two lights:
everything else follows pretty naturally from here!
