What is the Ħaġa Moħġaġa game, how does it work?

According to the introduction of DavDav Games Studios, Ħaġa Moħġaġa is a Word game on the Android platform. There is currently a 2.6.5.0 version released on Mar 04, 2020, you can see the details below.

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Make sure that third-party apps are allowed on your device: go to Menu->Settings->Security-> and check "Unknown Sources"

Tap the APK file. Allow the app any required permissions it asks for. Then, at the bottom of the installer window, click INSTALL.

You'll see a confirmation the app is installed. Now you'll see the app available in your list of installed apps.