This can be one of the built-in themes, a theme from an expansion, or a theme from a mod. When players first open the map editor, they start by choosing a visual theme. The theme editor lets players adjust colors and textures to create new visual and cultural themes, the asset editor lets players preview their asset creations in the game engine and assign them random colors, and scenario editor lets players add triggers and conditions to an empty map or an existing city. The editors are all available on the main menu, and the map editor is the first one on the list.