In a number of the examples created in this book, you manually created data that the program will use. For instance, in some of the movement examples, you created a set of array values that you loaded into MMF at the start of the frame. These values were used as the basis of setting a specific set of movement points for different units on particular tiles. Rather than doing this process manually for each game, you could write an editor and make the process easier. In this chapter, you will look at creating a simple editor to create a set of information for your game.