You might want to hand-craft certain rooms or features, and have the game sometimes include them in your randomly generated levels. This chapter will help you do just that. It also builds upon the concept of meta-builders - that is builders that take the output of other builders, and improve upon the map.
Sometimes, you want to add some hand-crafted content into the mix of your level. You might want to use a whole level as a set-piece, and carefully place everything. You might want to include a cool structure on a map. This chapter walks you through designing prefabs, and teaches you to place them as either whole maps or into existing maps.