💡 Lights Out

1. The board starts with some lights ON (glowing yellow) and some OFF (dark). Your goal is to turn every light OFF.

2. Click any light to toggle it. This also toggles its direct neighbours (up, down, left, right). Corner & edge cells have fewer neighbours.

3. The puzzle is always solvable; every generated board has a guaranteed solution.

4. The timer starts on your first click and stops when all lights are off.

5. Use 💡 Hint to highlight one optimal next move (costs no penalty; it is just for learning!).

6. Use ↺ Reset to restore the board to its original state without generating a new puzzle.

7. Choose a grid size (3×3 to 7×7) and difficulty (controls how many lights start on).

8. Try to solve each puzzle in as few moves as possible. The fewer, the better!