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The standard form of this puzzle consists of a grid where some cells are initially blacked in, and some of those contain numbers. To solve it, place lights (which illuminate all squares in a horizontal or vertical line from the light to the next black square or the edge of the puzzle) in some cells so that every square is illuminated by at least one light, no light is illuminated by another light, and the number of lights orthogonally adjacent to each number matches the number.
Also called: Light Up puzzle
MIT Mystery Hunt 2007 Puzzle Editing
MIT Mystery Hunt 2010 Lighten Up (variant)
MIT Mystery Hunt 2014 A Puzzle with the Answer I WANT TO HOLD YOUR HAND
MIT Mystery Hunt 2018 Deploy
MIT Mystery Hunt 2019 Schematics