PDF

or solve online (using our beta test of Penpa-Edit tools in akari mode; left click to place a light bulb and right click to mark an unused cell with a dot; clicking and dragging draws lines for “seen” cells).

Theme: Logical (for patron Valvino)

Author/Opus: This is the 135th puzzle from our contributing puzzlemaster Prasanna Seshadri.

Rules: Add a light bulb to exactly one cell in each bold bordered white cell region so that each white cell is lit up. Each light bulb illuminates the cell it is in, as well as any horizontally and vertically adjacent cells, stopping at any black cells. No bulb can illuminate another bulb.

Answer String: For each row from top to bottom, enter the number of bulbs in that row. Enter these numbers as a single string with no separators.

Solution: PDF

Time Standards (highlight to view): Grandmaster = 1:15, Master = 2:15, Expert = 4:30