The app is totally safe to download. USM is the developer of Die drei ??? which can be found in the Adventure Games category. The game was rated 4.7 on Google Play.
Over 5K users downloaded and set up this application and its most recent release was on Oct 5, 2016. It's free to get the installation package of Die drei ???, also, you can check out users' reviews on Droid Informer. The app works fine on Android 4.0 and higher.