Plugin systems in a lot of software effectively are just dll/so files loaded at runtime, you could even enable reloading them at runtime. Usually you would wan

Plugin systems in a lot of software effectively are just dll/so files loaded at runtime, you could even enable reloading them at runtime. Usually you would want to hot reload the code sections though and allow the application to change the data section which is significantly more intuitive than changing source code to change data. Edit: On that note most game engines serialise state to disk, pretty sure it would be easy to just read the state from like a yaml file and update the state if you really don't want to write an interface. TLDR: There are significantly easier solutions to "how do I update the value of a variable at runtime" than hooking into the running process and changing the variable in memory.