OOD - How to desing and structure the projects to avoid redeploying the main Application (factory pattern?)?

It sounds like you want a plugin-based design. I'm assuming this is C#. What you want to do is design a strict set of Interfaces, that define the games, game loader, etc. Then you use Assembly.LoadFrom() to load all the DLLs, and use reflection to get the exported classes that inherit from those interfaces, from those assemblies, and instantiate new objects.

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