[Q] G3 apk wont install topic

hey guys.. i got my self a g3 few days ago. since they ive been trying to put cracked games in to it. yet the problem is most of the time the apk's wont install. it give a error saying ( **Application name** not installed) but certain once do. so what i did was i tried to track down the versions that are compatible and again i tried to install those apk's.. still didnt work ex- ( modern combat 4 , 5 , NFS mostwanted etc) to be clear i have enabled unknown sources and verify apps :/

if you guys can.. plz tell me how to get rid of this issue? if not at least send me some links to download functional apk's :( i so badly wanna use my phone to play some games ..

Thanks