What is the FACTO Schule Lv.2 Numbers game, how does it work?

According to the introduction of (주)타임교육, FACTO Schule Lv.2 Numbers is a Educational game on the Android platform. There is currently a 1.0.8 version released on Feb 28, 2020, you can see the details below.

You can learn "numbers," one of the five main content areas for the primary mathematics curriculum.
f you play 3 games, the guest gets delicious pancakes and a stamp on the coupon book!
Food trucks will be upgraded every time you drive through 6 towns!
Become the owner of a great food truck.

*Awards
"The Grand Prize in Solution Field" - 2019 E-Learning Korea Awards

* BASE (a holder) and materials for Numbers (Lv.2) required. http://www.factoschule.com

* The FACTO Schule App is optimized for Samsung Galaxy S8, S9, S10, note8, note9, and Galaxy Tab (2017, 2019) devices. If you use other devices, it may not work properly.

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

Download APK and OBB file and open the APK file, tap apk file, then hit Install and do not run yet.

After successful installation, you need to place OBB file in the place
<shared-storage>/Android/obb/com.facto.numberlv2/main.9.com.facto.numberlv2.obb