Design Philosophy Development Approach Technical Arrrchitecture Implementation Notes and Challenges What went right? What went wrong? Conclusions and Recommendations Puzzle Pirates Case Study

Design Philosophy Fun over Realism, Simplicity MMP from the outset no single-player Clean start with no legacy code Latency tolerant Client distrusting Minimize Client-Server Transactions

Development Approach Small Team Get to public Alpha quickly Spiral Development Model Contained Design (hoho) Modular, Re-usable code Frequent Refactoring Divided work by Feature, not Client vs. Server Use of Java and Open-source

Technical Arrrchitecture Built on mature distributed application framework (DObject) Designed as a distributed system first, a game second Client/server architecture with server maintaining canonical world view Simultaneously developed the game and our own Narya game development library (40% of code in library, 60% game specific) Code separated into modules and then further separated into client, server and shared code

What Went Right It works! Low server-side overhead, low bandwidth requirements Cross-platform worked well: –all engineering (client and server) done on GNU/Linux (Debian) –servers running on GNU/Linux and FreeBSD –nearly all users are on Windows –some issues with MacOS X but it works Very few incidents of server instability Few incidents of hacking; none were game destabilizing

What Went Wrong Java is still not very good for graphics and sound code: –graphics performance is difficult to profile, hard to tune, not as fast as we'd like –Java's sound support is high-latency and sometimes crashes VM –things matured a lot during our 3+ years of development but we're still going to switch to OpenGL (JOGL or LWJGL) for the next project Testing has been poor and we've been saved from disaster only by anal programmers, luck and a tolerant user base Tried using Java Web Start for deployment and patches, eventually had to replace it because it was neither robust nor scalable

Conclusions and Recommendations Design the game as an MMP and incorporate the network into the design Start with an architecture designed for distributed applications, not one designed for realtime single player games Good development approach is at least as important as games experience Code quality paramount in MMP development Java great for server, good for client