Depends on the game itself, some game, have the server just accept anything without validating, such example is Day R Survival
and on the other hand, some game validate everything on the server or fully server side, such example is Clash of Clans
and for what MrSx refering not using GG is, literally hacking the game server (maybe) and that's outside the scope of GG and preferably dont do it, cuz that's literally a crime lmao
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AngelWolf's post in About Mobile Online in-real time game hacks was marked as the answer