With Ultra Firewall. you can block any app you want from connecting to internet through wifi and/or mobile data.
Or you simple don't want ads is showed on your offline game just block that app.

* Current issue: it seems not to be working with 4G LTE network

*Features:
+ Block apps from connecting to internet through wifi/data
+ Auto start firewall on boot completed if firewall is enabled



#Note
+ This app required root access to work properly. So your device must be rooted
+ For xiaomi devices to auto start firewall on boot completed. You need allow this app auto start by some steps below:
- Open Security app on your phone.
- Tap on Permissions it'll show you two options: Autostart and Permissions
- Tap on Autostart it'll show you list of apps with on or off toggle buttons.
- Turn on toggle of this app you're done!