How to play
- Put bulbs in white cells so every white cell is lit.
- A bulb lights its row and column until a black cell stops the light.
- No bulb may shine on another bulb.
- A number counts the bulbs on the four sides of its black cell.
- Tap a cell once for a bulb, twice for a dot that means “no bulb here”. Drag to place dots.
Keyboard: arrows to move, space to cycle, b bulb, x dot.
Learn the logic behind it