If you have insufficient internal memory space in your android device, you may have a difficulty in installing the game. 

Please refer to the steps below 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 > Tap [Clear cache]

■ Delete apps not in use & data

- Delete apps, photos, videos not in use

※ How to clear cache can be different depending on the device.