This is an example of a completed LightUp puzzle. Your aim is to place light bulbs in to the grid so that,
- All white cells in the grid are lit.
- One light bulb is not lighting another light bulb.
- Some of the black cells in the grid will have number clues. This clue tells you how many light
bulbs are surrounding that cell.
A light bulb will light all the cells horizontally and vertically away from it until it either hits the
grid's edge, or reaches a black cell.