

The game simulates the diffusion of gases and equalization of atmospheres when a new natural chamber is opened, which can cause oxygen levels to drop in existing chambers, as well as the draining of liquids by gravity. The world also contains several hazards such as diseases and extreme temperatures. While initial areas have a breathable atmosphere, subsequent areas are in a vacuum or lack oxygen, requiring proper preparation by the duplicants before they explore these areas. The world is then subdivided into various regions or "biomes" that contain different and often biome specific materials and critters. Each game's world is procedurally generated. The player must monitor the duplicants' hunger, waste, and oxygen levels to keep them alive. The player is tasked with managing and taking care of these duplicants as they try to survive and create a sustainable makeshift space colony. At the start of a new game, three colonists (referred to as duplicants) find themselves in an asteroid with isolated pockets of breathable atmosphere, with no memory how they got there.

Of the two, Polluted Water should be dealt with first, because the Slime does not become a problem until they are excavated. The bulk of the Marsh Biome's resources are Slime and Polluted Water.Tall and thin slush room, containing Carbon Dioxide, Water, Polluted Water, Slime and Algae.

Blob slush room, containing Carbon Dioxide, Water, Polluted Water, Slime and Algae.Geode, containing Sand, Sandstone and Igneous Rock.Tall and thin room, containing Carbon Dioxide, Polluted Water, Slime and Algae.Blob room, containing Carbon Dioxide, Polluted Water, Slime and Algae.
