Antewise

Oxygen Not Included Difficulty Guide

Updated 20 Oct 2026 Source Synthesized from published Oxygennotincluded guides; rewritten in original wording on 20 October 2026 By

Systems over levels

There is no character level. The asteroid punishes a broken loop, not a slow duplicant. Fix the system first.

Read the trend

Watch oxygen and food over time. A falling line means a loop leaks, and digging will not fix it.

Scale the loops

Each new duplicant doubles demand. Grow life support before you grow the population.

Come back cleaner

A failed colony teaches the missing loop. The next one builds it from the start.

Separate the heat

Deep biomes run hot. Seal hot rooms so the warmth does not cook your food chain.

Build to scale

The building database lists the kit to grow loops. Add it before the new duplicant arrives.

Count the mouths

Every duplicant is a new drain. Hatch them only when the loops can feed them.

Expect the bad gas

Deep digging opens hostile gases. Vent them fast or the whole base slows.

Track the species

The critter database shows what the deeper biomes hold. Plan ranches for the ones worth taming.

Count each mouth

Every duplicant is a fresh drain. Hatch them only once the loops can feed the added body.

Brace for gas

Deep digging frees hostile gases. Vent them fast or the whole base crawls to a stop.

Note the species

Deeper biomes hide useful critters. Plan ranches for the ones worth taming from the start.

Buildings that scale loops

  • Printing Pod (cat Buildings, effect Light Range: 5 tiles)
  • Plumbing (Building)
  • Decor
  • Cell of Interest
  • Stations (Building)
  • Rocket
  • Base (Building)
  • Utilities (Building)
  • Power (Building)
  • Building
  • Refinement (Building)
  • Overheating
  • Radiation Sensor
  • Rocketry (Building)
  • Piping
  • Ventilation (Building)
  • Furniture (Building)
  • Great Monument (cat Buildings)

Critters of deeper biomes

  • Shine Bug
  • Critter
  • Drecko
  • Plug Slug
  • Hatch
  • Egg
  • Critter Morphs
  • Pacu
  • Puft
  • Gassy Moo
  • Morb
  • Shove Vole
  • Pokeshell
  • Slickster
  • Pip

Frequently asked questions

Does the game get harder?

Yes. Deeper biomes bring heat, germs and scarce resources that strain every loop you built.

How do I know a colony is stuck?

When oxygen or food trends down despite your builds, a loop is broken and needs fixing, not more digging.

More Oxygen Not Included guides

Sources

Figures and item data on this site are read from the game’s own reference wiki before publishing. Where a value could not be confirmed there, the page says so instead of filling the gap.