[Q] apk modding question topic

hello. i am interested in how to mod an apk for offline capability.
for example, Asphalt 8 game, is now version 1.2.1b i have searched offline mods, i only find "unlimited money". i just want offline, no money, no nothing.
i have apktool, i have java development, i have signapk, i have software for apk midification. can you guys help me? either make my apk offline, or tell me how to do it?