Well-designed gameplay shares characteristics with effective learning experiences. Through analysis of commercial computer games I established that a successful game is a series of goal related skills increasing in difficultly until attainment of the overall goal is achieved. Kiili (2005) offers support for this when talking about online games satisfying the basic requirements of learning environments
which provide engaging learning experiences for students
VAST is a light-weight network library to support scalable peer-to-peer (P2P) virtual environment / virtual world applications such as Massively Multiplayer Online Games (MMOGs). It is based on the research of Voronoi-based Overlay Network (VON) published
M. Ageev, Q. Guo, D. Lagun, and E. Agichtein. Proceedings of the 34th international ACM SIGIR conference on Research and development in Information Retrieval, page 345--354. New York, NY, USA, ACM, (2011)