1. A system, comprising; one or more computing devices configured to implement a game system comprising: a game engine configured to render a virtual object within a game universe according to an object model that specifies characteristics of a physical object; a design module configured to modify the virtual object within the game universe according to design input from a game client; wherein the game engine is further configured to simulate interactions of the modified virtual object within the game universe at least in part in response to game input from one or more game clients, wherein the simulated interactions model real-world physical interactions; and a data collection module configured to collect performance data for the modified virtual object within the game universe and provide the collected performance data to an object producer external to the game system.