It was a day like any other. People working their day-to-day as best they can, sunlight squinting out from between clouds, cars passing cars in the street. Business as usual.

Until the lights went out.

In one instant, all light vanished from the world. Lightbulbs, torches, the sun... Nobody quite understood what had happened. But everybody knew in some instinctual, undeniable part of them that something had happened that could never be reversed.

You are a Spark, the last light left on the face of the planet. Through dark streets you flit, guiding the lost people in crowds out of their cities in search of a place of illumination. You may move between lightbulbs, car headlights, streetlamps, appliances, and anything else that may normally emit light by highlighting it with the cursor and clicking to inhabit it. From there, you radiate light, guiding nearby people toward yourself like moths to a flame, and it is with this that you will lead them.

But be careful, for the people are fearful in the dark and will not move if they are not lit; you will need to be careful not to leave anyone behind. If you stay in one bulb or appliance for too long your energy will cause it to start flickering, eventually depleting its resources and short-circuiting it, which will render it unusable an decrease your options.

Be careful not to linger too long in the open air either, lest you burn out and extinguish yourself before reaching safe haven. With no stars left in the sky, you are all that's left...