Unlike Android, we were able to easily modify our Unity app right in the editor without writing code. In fact, given the right Unity extensions, you can make a working game in Unity without any code. However, for us, we want to get into the nitty-gritty details of ARCore, and that will require writing some code. Jump back to the Unity editor, and let's look at how we can modify some code by implementing the following exercise:

1. From the Hierarchy window, select the ExampleController object. This will pull up the object in the Inspector window.
2. Select the Gear icon beside Hello AR Controller (Script) and from the context menu, select Edit Script, as in the following excerpt:

3. This will open your script editor and load the script, by default, MonoDevelop.