Easy! Simply turn off the fireflies. Aaarghhh! Some of the others switched themselves on! This is not going to be as easy as I thought!

Click 'PLAY' below to start, and watch a battalion of fireflies arrive and light up.
Click lit-up fireflies to turn them off, or click turned-off ones to turn them on (so to speak).
But don't ask us how it works, or how to solve it (apparently it is possible)!