Welcome to the second part of the book, dedicated to designing and constructing the game world of Celtic Crusader. In these chapters you will learn how to create a game tool, a level editor for the game world. This subject falls under the banner of tools programming, and is one of the most highly sought-after skills in the game industry. After perusing the design of the game (i.e., the “big picture”), we will create a level editor and build one of the first regions of the game world. Once the first level is available, we will then learn how to load and draw it, and then chase that topic with a jaunt through sprite drawing once again. This part concludes with a chapter covering portals, an important concept that allows you to create a world much larger than available memory will allow.