Faced with a dark grid filled with unknowns, you are both an explorer who illuminates the way and a strategist who solves the puzzle. Based on numerical rules, you determine the position of the lights so that the light covers each grid without overlapping or missing anything. As the light gradually spreads according to your plan, the dark areas are illuminated one by one. The thrill of controlling the light and shadow and unlocking the whole picture will make every puzzle-solving experience full of anticipation and satisfaction.