1. Download APK first, then copy to your Android device's SD card

2. Install APK, DO NOT open app

3. Download obb files, then rename to 'main.2015.com.artifexmundi.grimlegends3.gp.free.obb'

4. Copy obb file to /SDCARD/Android/obb/com.artifexmundi.grimlegends3.gp.free/main.2015.com.artifexmundi.grimlegends3.gp.free.obb