Overview
You have a grid of squares. Some are filled in black; some of the black squares are numbered. Your aim is to ‘light up’ all the empty squares by placing light bulbs in some of them.
Each light bulb illuminates the square it is on, plus all squares in line with it horizontally or vertically unless a black square is blocking the way.
To win the game, you must satisfy the following conditions: all non-black squares are lit; no light is lit by another light; every numbered black square has as many lights adjacent to it (in the four squares above, below, and to the side) as its number says. Non-numbered black squares may have any number of lights adjacent to them.
Credit for this puzzle goes to Nikoli. Light Up was contributed to this collection by James Harvey.
- Made by
- James Harvey, Simon Tatham