Sony Mobile has updated their AR Effect app to version 4.3.4 with more new features. This will replace the previous 4.2.5 from the new 4.3.4 version. So in this update we can see a new feature, actually it is a theme which is knows as the Mask theme. Mask theme is added by default and you cannot download the theme only. If you want the mask theme you should update the whole app. Update is live on Google Play right now.