Before we start a process of prototyping the location in 3D, ussualy using tools from chosen engine it’s good to illustrate our idea with graphs. Of course, it’s possible to draw only a simple scheme on paper (what I personally practice) but that way we might miss mistakes we would find by making graphs. Why? Because graphs give us a specific pattern with which we have a detailed overview on our project. It is because we include all the events which have to happen during the gameplay. It allows us to check if everything works fine like moving through locations and playing certain events.