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
Finally a game half open. You start with a small creature and when you make offspring you go to an editor to design them. At any time the game populates the system with creatures designed by other players. First 2d, then 3d water, then walk
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M. Sipper, Y. Azaria, A. Hauptman, and Y. Shichel. IEEE Transactions on Systems, Man and Cybernetics,
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583--593(July 2007)