Puzzle Copyright © Kevin Stone
• Light up every square in the grid.
• A number in a square indicates how many bulbs share an edge (but not diagonally) with that square.
• A square is lit if it's in the same row or column as a bulb, as long as there are no black blocks between them.
• No bulb may light another bulb.
Puzzle Code = LightUp-0528-20x20-Level3-J588068 = www.brainbashers.com/j588068