This is a second generation feature that allows you to block all message notifications while you are playing games. When this feature is turned on ,all notifications from IM apps, such as WeChat, QQ, Line, Messenger, WhatsApp, Viber, Skype, will be blocked in order to offer you a more immersive gaming experience without interruptions.
After you launch a game, swipe in from the left edge to call out Game Genie > Tap No alerts icon to turn it on/off.