One of Unity's most compelling features is its ability to be cross-platform across any system, and with that comes several helpful layers of abstraction that we can use to inject our code into. However, the game in question needs to be following the Unity best practices in order to make this injection easy. That isn't to say that we couldn't do it by overriding the game's input system; it just wouldn't be as easy.
Before we get into describing how the injection works, let's take a step back and look at the best practices for using the Unity input system. Over the years, the Unity input system has evolved from a simple query that the device uses for inputs to the more cross-platform system that it uses now. However, many developers, including Unity itself, still use input methods that query a particular key code...
