Features simulated climate modelling that displaces rainwater across the surface and factors in surface temperature to allocate biome types. Biomes range from cold icy regions, through temperate forests and harsh deserts. Mountain ranges are visible from orbit, and numerous tree species are commonplace. Often home to the remains of human settlements, cities and colonies, and a good source of common resource types.

These huge swirling balls of gas layers can be picturesque, yet deceitful, for they hide often dangerous storm formations and gravity wells. Maintaining orbital positions consumes more power than other planet types, and 'surface' excursions are limited to gas mining ventures which are fully exposed to the harshness of the planet atmosphere. Tend to have a lot of smaller moons to explore, so become a mini system in their own right.