Design your own nation. See Making a New Nation . Design a set of faces to represent the city inhabitants. For graphics format see system.bmp. Assemble a set of sounds for the game.
Sound support is built in, but there are no sound files included in the package.
Choose a background graphic for the start screen. Change any other graphics, all of them come in BMP format. Localize the game to your native language by translating the language.txt and help.txt. Implement your own Artifical Intelligence module, an absolute focus of this project. The AI development manual comes with the game package.