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by matheusmoreira 2247 days ago
> The bigger problem for the parent commenter is if actual game logic is executing on the server, which is probably the case for online multiplayer games.

Yes. I used to play on unofficial MMORPG servers back in the day. People reverse-engineered the network protocol and created an open source game server. It didn't have all the features of the official game but it ran fine and could be freely modded. I used to host one of these on my own home computer... Traditionally the official game client is used but some games even have custom clients!

Examples:

https://github.com/opentibia/server

https://github.com/otland/forgottenserver

https://www.wireshark.org/docs/dfref/t/tibia.html