i can download game in app store

Marking your own post as Solved may prevent others from trying to help because they think you have fixed your problem.

You can download the game or you can't download the game?

If you can't download the game, see the Apple Support article(s) below. 

Apps won’t downloaded. 

App Store, iTunes Store, or other Apple services - If you can't connect      

Some things you can try. Do you have access to another WiFi network where you can try? That has worked for several people.

Try a restart.

Restart your iPhone, iPad, or iPod touch         

Try a forced restart.

Reset Device.      

If necessary

Hard reset.        

Do a backup and try a factory reset. Then restore from your backup.

Restore to Factory setting.      

Restore - If you see an error when you update or restore your iPhone, iPad, or iPod

Backup - Restore your device from an iCloud or iTunes backup.