Spoiler-light progression

Pathogenic Body Regions

The six main organs in Pathogenic, in progression order, with only mechanics confirmed by official achievements and developer updates.

Read the route as a changing test

The six regions are listed in progression order, but the useful question is what each region asks the build to prove. Early rooms expose a broken chain; later organs punish weak movement, routing or single-target damage.

Room layouts and rewards can vary between runs. Use the map and room indicators, preserve a working core before entering a boss route, and treat the Brain as separate secret content rather than a seventh main organ.

  • Skin: validate that the main attack, power source and movement plan work together.
  • Intestine and Stomach: protect health and routing choices before spending on optional rewards.
  • Liver and Lung: keep enough range, movement and field awareness for stronger enemy mixes and airflow hazards.
  • Heart: bring a repeatable single-target answer; clearing ordinary rooms is not the same test as clearing the boss.

  1. Region 1

    Skin

    The first main region; Steam lists a boss-clear achievement.

  2. Region 2

    Intestine

    Its February 12 demo update described Intestinal Villi that slow the Pathogen.

  3. Region 3

    Stomach

    One of the six main regions with its own boss achievement.

  4. Region 4

    Liver

    Its April 16 demo update introduced T Cells, B Cells and Dendritic Cells.

  5. Region 5

    Lung

    The May 28 developer preview documented airflow-based hazards and attacks.

  6. Region 6

    Heart

    The sixth main region and the target of multiple run-clear achievements.

Brain is secret content and is not counted among the six main progression regions. Official achievements confirm its name but hide its entrance requirement.