Switches

How to play

Turn off every light on the board.

• Tap a light to flip it and the four lights beside it.
• Lights on an edge or corner have fewer neighbours.
• The counter shows how many lights are still on.
• Tapping the same light again undoes it.

Tips

• Clear the top row first, then never touch it again.
• The order does not matter, only which lights you tap.
• Every board can be cleared: it is built from an empty one.