This significantly depends on your skill set, available resources, and time and energy. For Galaxy on Fire 2, I was fortunate to be exposed to a little information during my training, and I am aware you can find information on modding this game on Android if you search the web.

Modding in general, when not supported, has historically involved creative reverse engineering of software, which is a skill one can learn by laboriously investigating programs one has built one’s self as a software developer. It is much more effective to use algorithms trained to perform generic modding and reverse engineering, which you can begin to train yourself by collecting suitable data.
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