From publisher blurb: This rule supplement provides several expanded rules for more varied and nuanced world generation in Stars Without Number, from taking into account the atmosphere's and biosphere's influence on the world's population to a plethora of new and expanded world tags. Included are: Expanded generation tables for atmosphere, temperature, biosphere, population, and tech level. Expanded interaction between the various world characteristics, such as the atmosphere's influence on population or the population size's influence on the tech level. 14 new World Tags. Two examples of expanded world generation.