Exotic worlds are characterized by having various mysterious objects not found in any other biomes. When viewed from space, most of them look rocky and pockmarked by holes. However, there are some that look like giant, artificial Hex worlds. The games' code for these worlds is "Weird".

Unlike dead worlds, there is no elevated strain on life support. Unique structures and, very rarely, vacant bases can be found here as well. Gold deposits can sometimes be found on these planets. Exotic worlds will never have water.

More uniquely than other biomes, flora and minerals are wholly determined by the specific sub type of exotic biome; Exotic biomes will only have a handful of unique flora and mineral types exclusive to this biome. An exotic biome will almost always have only one type of fauna, although rare cases of exotic worlds with two species of fauna have been found.

A single unique Stabilised Reality Glitch will be found in each exotic biome.

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The Beam subbiome, is an anomaly type featuring a planet covered in stone structures which resemble unfolded umbrellas, with some of them emitting blue-ish green particles into the sky. These pillars are often seen with green mists swirling around them. Smaller versions of these Light Fissures can be found at specific points on the planet to be secured and brought back home into the safety of a base and lab, or showcased as an exotic trophy. Less dead variants of these fissures, the Living Geysers or Living Plasma Balls can be seen on some beam worlds.