If you have insufficient internal memory space on your Android device, you may have difficulties installing the game. 

Please refer to the following steps to make sure that your device has sufficient internal memory space before installing the game. 

■ How to Optimize Internal Storage Space: Delete cache of applications in use 

- [Settings] > [Apps] > Select apps > Storage > Click [Clear Cache]

■ Delete data & apps not in use

- Delete apps, photos, videos not in use

※ How to clear cache may vary depending on the device.