1.) Open Unity3D 5.6.3 or Higher
2.) Import 2 cars clone.unitypackage in Unity3D.
3.) Switch the project to Android Platform or iOS Platform. Go to File -> Build Settings -> Select “Android” or “iOS” -> Click on Switch platform.
4.) Game has been developed in PORTRAIT MODE. Go to File-> Build Settings -> Player Settings -> Resolution and Presentation -> Set Default Orientation as “Portrait”.
5.) Go to File -> Build Settings -> Drag and drop all scenes located in Scenes folder into Build Settings window(build in scene) - main Menu scene as first scene in priority.
6.) Now Play the game from Main Menu.
7.) That’s it.