On the planet of Stygia, a catastrophic collision has thrown the world out of control. Thousands are left in perpetual darkness, inhabiting the bleak, murky cities on the dark side of the globe, huddling together to find warmth. Help the Stygian people by guiding rays of light towards their settlements, restore light, hope, and sanity to them; help them rebuild their civilisation and grow again.

You control giant, orbital prisms, which are used to redirect stray beams of sunlight. Find a way to bring each city the colour of light that it needs to survive, and ensure that nobody is left behind.