For the overall visual theme, the game will have medieval aesthetics (castles, village houses, torches, etc.). One map may have multiple biomes, and each one might have many areas with different sections and themes. For example, the grassland biome may be divided into forests with many trees, fields with short vegetation, and bush areas surrounding rivers. While multiple areas with different biomes are not necessarily required, all maps should have areas with differences (even if small) in gameplay, otherwise, the map will be dull. The biomes are generally a visual thing and may not be related to such gameplay differences between the areas of the map. Some exceptions are places that thematically have trees, houses, or ice.