On top of a load of stages that are contained within a handful of themed areas, you can also create your own tracks. (videochums.com)
Furthermore, common databases (e.g., car paints) are built up, with all participants taking part of the load in supplying reference samples and information as well as making standardized measurements. (sciencemag.org)
The only other real issue is in terms of load times. (popgeeks.net)