|Alien planet||Takes place on a world that resembles little if at all of our Earth.||1975 / 2016||129 games|
|Ether||A non-place somewhere (e.g. between dimensions). Often characterized by lack of any planet or other large firmament, but contains small islands, or even artificial structures, floating in a starry ocean without sun or moon.||1993 / 2018||19 games|
|Mutant plants||Plants that have mutated to a point at which they're barely or not at all recognizable.||2010 / 2011||5 games|
|Subterranean forest||A forest or similar large vegetation that should only grow above ground with help of sun, rain, etc. can be found underground.||1994 / 2015||11 games|
|World edge||The farthest reaches of non-spherical worlds or possibly spherical ones as well (e.g. it has single continent). Commonly abnormally dangerous place with laws of nature being broken or twisted.||2011 / 2015||4 games|
Any locations that try to deliver a sense of this-is-not-on-Earth.