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📖 How to play

  1. Click an empty white cell to mark it (✕); click again to place a bulb (💡); click once more to clear.
  2. A bulb lights its row and column up to the next black wall.
  3. No two bulbs may see each other along a clear row or column.
  4. A numbered black wall must have exactly that many bulbs orthogonally adjacent.
Example

The grid has white cells, plain black walls, and numbered walls.

A bulb lights its row + column up to the next black wall.

Mark ✕ on cells that can't host a bulb — they sit in another bulb's sight line.

Every white cell is lit, the wall's count is satisfied, and no bulb sees another.

💡 Tip: Click an empty cell to mark it (✕), click again for a bulb (💡), click once more to clear.