First draft rules text is adapted from that at nikoli.com
Place light bulbs (circles) according to the following rules:
1. A number in a black square indicates how many light bulbs are in the vertically and horizontally adjacent squares.
2. Light bulbs can be placed in any white square - it does not need to be adjacent to a black square.
3. Each light bulb illuminates every square in its row and column until it hits a black square or the edge of the grid.
4. All white squares must be illuminated, and light bulbs must never illuminate each other.
Last edited by nickdeller
on Tue 18 Jan, 2011 3:40 pm, edited 1 time in total.