Solemn Sandbox

Solemn Sandbox is a 2D physics-based creature evolution sandbox inspired by Evolution by Keiwan. You build creatures from joints, bones, rigid struts and muscles, then give them a task and allow a neural-network controller to evolve through a genetic algorithm. Creatures can currently be trained to walk, jump, climb, fly and tackle different environments and obstacle courses. There is also an environment builder, saved creature and brain libraries, head-to-head challenges, trophies and experimental features such as a Disco mode where music can be routed into creature muscles. There are no predefined walking or flying animations. The creature exists inside the physics simulation and evolution has to discover useful ways of controlling whatever body you have built.