Sony xperia m4 aqua memory
Enter the following commands in a terminal emulator after you have rooted and installed busybox:

su
ln -s /storage/sdcard1/Android/obb/ /storage/sdcard/Android/obb/


Copy the games extra data (.obb) files to Android/obb/ folder on your SD card from your computer. This may or may not work with games downloaded from Google Play, I have not tested it.