Objective
Illuminate the entire gray area of the grid with yellow "light" by
placing "light bulbs" (white dots) on the grid according to the
conditions of the game.
Conditions
- A light bulb illuminates all squares in 4 directions of the row
and column where it is placed unless blocked by a black square.
- No light bulb may occupy a square illuminated by another
light bulb.
- Black squares with numbers 1-4 require a corresponding number of
light bulbs be placed beside them vertically or horizontally.
- The number 0 in a black square prohibits any light bulb
from being placed beside it horizontally or vertically.
Play
Touch or left-click to place or remove a light bulb. Mouse
right-click to place and remove a marker.
