MMOG are very large distributed applications, sharing very large states, and supporting communication between potentially thousands of player nodes. Despite the development of many solutions to define suitable architecture and communication protocol, and enabling efficient deployment of these types of applications, many issues remains which still require a solution. In this paper we discuss MMOG deployed over a Peer-to-Peer architecture, supporting a distributed model of systems with shared state and we address issues related to scalability, interest management and communication. We identify an efficient partitioning and distribution of the shared state as an important aspect in such models and propose a hierarchical multi-level interest management algorithm which enables contextual communication between peers. Experiments have been carried out and show the performance of the approach.
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