READ FIRST!• Theme works ONLY with custom 7.1.x/ 8.0 ROMs with OMS support on any device and 8.0 stock ROMs on Nexus/Pixel devices. • Theme doesn’t work well on LineageOS based ROMs (many apps may fc) • Theme doesn’t work on any other devices devices with stock rom • You need substratum app from the Play Store to apply the themeIMPORTANT! When you open the theme in substratum app you’ll see the drop down menu on top of the overlays. You need to choose one depending of your ROM android version.NOTE: Some apps like AOSP Clock, Calendar, Messaging, MusicFX and Gallery may or may not work, because every custom ROM has their own variant of those apps, so if you get an error while compiling, just don’t install them.After every update I recommend clean install (uninstall all the overlays from the previous version, and then install the new ones)

// Option A //

To download Mono/Art [substratum] mod from HappyMod.com.
You need enable the option "Unknown Sources".
1. Click on the above link to download Mono/Art [substratum] mod APK.
2. Save the file in your device Downloads folder.
3. Now tap on Install and wait for the installation to finish.
4. Once it is done, open the game and start playing it right away.

// Option B //

To download Mono/Art [substratum] from HappyMod APP, you can follow this:
1. Open your browser and download the HappyMod APK file from HappyMod.com - the only official website of HappyMod.
2. Open Android Settings and go into Privacy or Security.
3. Tap the option to Allow Unknown Sources and enable it.
4. Go to your Android downloads and tap the APK file.
5. Follow the directions on the screen to install it.
6. Search Mono/Art [substratum] in HappyMod App.