Thrive is a open-source non-profit game that aims to be Spore-like in that it runs through stages from a single-celled organism to a space-born civilization while letting you edit and evolve your species along the way. But it also has a heavy emphasis on providing a convincing and interesting evolution simulation, so that the world changes around you. We also try to keep things scientifically accurate wherever we can, but the focus is on the gameplay experience.

This update in particular adds sexual reproduction, lets you make muscle cells and enables our automatic evolution system to create Multicellular species. But there are also many other additions and improvements, large and small.