Special rooms play by their own rules and are outlined in colour on the minimap. The Mutation Chamber and Gene Chamber are in every organ; altars, puzzles and event rooms arrive with the Special Rooms mechanic (Level 3), and tumor rooms with Tumors & Metastasis (Level 7). Trade-off Altars, puzzle rooms, Gene Chambers, Immune Sieges and Lysis Chambers have their corners cut into an octagon 40% of the time; the Mutation Chamber, Mutagenic Pool, Refuge and tumor rooms are always plain rectangles.
A key guardian holds this organ's gene; beat it, then take the gene to open the sealed door.
Usually tucked in a dead end
The gene appears where the guardian stood
The gene also grants a lasting passive bonus for the run
From the Codex
Viruses carry genes for tools that break host barriers, like neuraminidase that cuts through mucus, or fusion peptides that merge viral and cell membranes.
Fun fact: Neuraminidase is the target of Tamiflu: block it, and new flu virions get stuck to the cell they came from.
Bind all the receptors at once: light every pad before the first one fades.
3–4 pads on a ring around the room
Each pad stays lit 4.5 s after you step off
At most one puzzle per organ (45% of organs)
From the Codex
Viruses enter cells by binding receptors: proteins on the cell surface. Flu binds sialic acid; HIV needs CD4 plus a co-receptor (CCR5 or CXCR4), engaged in the right sequence.
Fun fact: Some people carry a CCR5 mutation (Δ32) that makes them highly resistant to most HIV strains.
Repeat the signal: watch 4 pads flash in order, then step on them in the same order.
A wrong pad shows WRONG SIGNAL, raises Detection and replays the signal
Shares the one-puzzle-per-organ slot with the Receptor Puzzle
From the Codex
Viruses enter cells by binding receptors: proteins on the cell surface. Flu binds sialic acid; HIV needs CD4 plus a co-receptor (CCR5 or CXCR4), engaged in the right sequence.
Fun fact: Some people carry a CCR5 mutation (Δ32) that makes them highly resistant to most HIV strains.
Solving either puzzle releases a strand of DNA and a pile of loot.
A mutation orb, a vesicle chest, 10 nucleotides and 2 Chaperone Proteins
Detection drops by 10
In Pandemic Game Mode, a chance of an RNA Strand
From the Codex
Viruses enter cells by binding receptors: proteins on the cell surface. Flu binds sialic acid; HIV needs CD4 plus a co-receptor (CCR5 or CXCR4), engaged in the right sequence.
Fun fact: Some people carry a CCR5 mutation (Δ32) that makes them highly resistant to most HIV strains.
A crossroads of 2–3 altars, each a bargain: something strong for a price. Step onto one, or walk away.
Offers are drawn from 5 bargains
Only one can be taken
Appears in about 60% of organs, and always in the organ that introduces special rooms
From the Codex
Evolution is full of trade-offs. A mutation that makes a virus more aggressive can also make it easier for the immune system to spot, or less stable outside the body.
Fun fact: Viruses that kill their hosts too quickly often spread worse; many evolve to become milder over time.
Bathe in the pool for a random trait, often a rare one, at a price.
Costs 20% of your current HP (it can't kill you)
The trait's tier odds are boosted: never Common
One use
From the Codex
Mutagens like radiation and some chemicals raise mutation rates. Some antivirals, like molnupiravir, work by pushing viruses into so many mutations they collapse.
Fun fact: This is called 'error catastrophe': too many mutations and the virus can no longer make working copies.
The doors seal around 9 host cells: burst as many as you can in 18 seconds.
Every host cell drops nucleotides
Burst them all for a vesicle chest and a mutation orb
If time runs out, the rest escape
Being knocked out fails the room, not the run
From the Codex
A virus can't copy itself on its own. It hijacks a host cell's machinery to make new virions, and lytic viruses then burst the cell open to release them.
Fun fact: One infected cell can release thousands of new flu virions before it dies.
A cancer grows here, a different one in every organ; destroy it for a huge payout before it spreads.
Grows in about 70% of organs once Tumors & Metastasis is introduced
The doors never lock: you can back out, but it keeps growing and spreading while you're away
The HUD tracks its stage and spread
Left alive, it follows you into the next organ
From the Codex
Cancer is the host's own cells dividing out of control after mutations break their brakes. Some viruses (HPV, Epstein-Barr, hepatitis B) can help cause it.
Fun fact: Oncolytic viruses are engineered to infect and burst cancer cells; T-VEC, a modified herpes virus, is approved for melanoma.
