Having one beautiful level is wonderful, but what if we have more - how do we connect them to ensure that the player sees them all? The process is actually quite simple and doesn't require much work from our side: any kind of level loading is done via code anyway. However, there are still things that we are required to take care of regardless.

As you must have noticed already, the levels are represented by scenes in Unity, and during development, we could have a large number of scenes piled up, some of which we would like to see in the final game, while others exist for testing purposes or prototypes. In order to avoid unnecessary assets being added to our final build, we need to list the scenes that will be included.

To do that, we go to File | Build Settings… of the top menu.

Right now, we are only interested at the top part of this window, but we shall revisit it later and talk about the rest of the options in the future. Scenes In Build is a list of all scenes that will...