The original Forza Horizon 3 installation is roughly on PC. Any "APK" claiming to be the full game that is only a few hundred megabytes or even a couple of gigabytes is a red flag. Downloading these files can lead to:
A puzzle-based car restoration game officially under the Forza brand. forza horizon 3 android apk obb download upd link
Poorly coded "clones" can cause your mobile hardware to overheat or crash. Alternatives for Racing Fans on Android The original Forza Horizon 3 installation is roughly on PC
While there is no "installable" APK for the full game, you can still play Forza Horizon 3 on an Android device using and Remote Play technology. forza horizon 3 android apk obb download upd link
Some developers create small-scale clones using assets from the game, but these are not the full Forza experience and are often buggy.