Hello, Hero Candidates! 


We're sorry to hear about your upsetting situation!

Please check the Minimum requirements of the device for game execution through the URL below.

URL : Minimum requirements

After checking the minimum requirements, run the game after updating the Devil Book app. 

Please check the OS of your device and refer to the game update method below.

 ■ AOS

 1. Open the Google Play Store app.

 2. Tap Menu > My Apps/Games. 

 3. Tap Update Devil Book.

 ※ If you can't see the Devil Book update, click the Update button to update your app list.



 1. Open the App Store.

 2. Tap the profile icon at the top of the screen.

 3. Update the Devil Book app at the bottom. 

 ※ If you can't see the Devil Book update, scroll down to update your app list.

If this problem persists, please email us at devilbook@ngelgames.freshdesk.com with your information.

1. Situation 

 - Time : ex) 21-01-31 15:44 [PDT]

 - Please briefly write about the problem.

2.Ingame Information

 - Account name : ex) ABC#12DE3

 - Game Version : ex)  

 - Time : ex) Feb 12, 11:14:45 [PST]

3.Device information 

 - Devico Name : ex) Galaxy Note 8+

 - Device OS : ex) AOS 5.1.1

 - Device Language : ex) English

※ If you attach photos or videos of your problem, we can help you furthermore.