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Mapcraft - Fantasy map designer

WorldGen - SciFi universe generator

Mapcraft Web - Web based fantasy map designer

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Life Level

The life level of a world defines (in very broad terms) how advanced native life is on the world. It ranges from no life at all, through simple single celled organisms, to land animals and extensive (Earth-life) conditions.

The life level of a planet is defined in the enum LifeType

Levels Explained


This planet has no life of any note. Note that worlds may have all the building blocks of life, but unless they actually have replicators, the world is considered to be lifeless.


Basic replicators are common, though no complex celled organisms are to be found. A world can stay in this state for quite a while before proceeding to Protozoa.


Single celled organisms. Once these develop, evolution starts to proceed rapidly. Such life forms will be found in the world's oceans. At this point life will be starting to have an effect on the atmosphere of the world.

This is similar to the Archaean era on Earth. It may last around a billion years.


Multi-celled organisms. These are still small and basic, but more complex than the simple Protozoa. The atmosphere has probably changed to high-energy types such as Oxygen, which will spur the development of more complex life forms.

This is probably similar to the Proterozoic period on Earth. It may last a couple of billion years.

Complex Ocean

Complex ocean life is common, including everything up to vertebrates. The land will be still mostly barren at this point, though some animals may have life cycles which involve the land. Note that this is the first level where the world can be said to have native animals.

This is pretty much equivalent to the Cambrian period and onwards (the start of the Phanerozoic eon), and represents a sudden surge in diversity of life forms. It lasts about 100 million years.

Simple Land

Simple land life is common, in the form of algae, mosses, insects, amphibians and later on plants. Modern forests are unheard of for many such worlds, though small tree-like plants and moss forests may exist. There are no large land animals.

This marks the Silurian period on Earth, where the first land animals were relatives of spiders and millipedes. It generally lasts a few tens of millions of years.

Complex Land

Animals which live entirely on land are common, and can be quite large, though the range is limited. Forests and other extensive vegetation are starting to take hold, but much of the land is bare.

This is similar to the Devonian period onwards. Seed bearing plants began to form forests, and the earliest tetrapods began to appear. It may last up to 100-200 million years.


Life can be found pretty much everywhere, with forests covering much of it where possible, and many large land animals - both predators and prey. It pretty much covers everything from the Triassic period onwards, though probably started somewhere in the Permian.

worldgen/planets/lifelevel.1247433238.txt.gz · Last modified: 2015/02/04 22:39 (external edit)