Super Mario Maker World Engine is a free, non-profit project created by independent developers for the gaming community. It is not affiliated with, endorsed by, or associated with Nintendo.
Because this is a fan project, it is not available on the Google Play Store. You will need to download the APK file and install it manually.
This is the most critical section. Because this is a fan project, it is . You must download it via third-party APK hosting sites.