How to play
Press a light to toggle it and its neighbours directly above, below, left and right. Turn off every light on the 5ร5 board to win. Every starting board has a solution.
A filled circle means on; an empty circle means off. Tap a cell, or select it with the arrow keys and press Enter or Space. Try to solve the board in as few moves as you can.
P or Escape pauses and resumes while the board has focus. Clicking outside the game or switching windows pauses automatically.