Rat Lab Mutations Guide: Create, Test, and Track Mutations

Quick answer

In Rat Lab, mutations are the Scientist’s system: Scientists “Create your OWN mutations and test them on lab rats” while Security handles escapes. The loop runs create → pick a colour → inject → track in the Mutation Index, and because “Your time resets every session,” tool unlocks — including the OP Mutations tier at roughly minute 60 — reset each match unless you own a Forever gamepass.

• The signature delivery tool is the mutation gun, with syringes used for the injection itself; both are earned per session.
• The Mutation Index “uses colour/mutation markers to track specimens” — “Colours are statuses, not codes,” so they are not redeemable promo strings.
• “Every match resets most tool unlocks unless you own Forever gamepasses”; OP Mutations arrive around the ~60-minute mark of a session.

How Scientists create and apply mutations

The game’s own description defines who touches mutations: “Lab Rats 🐁 - Attempt to escape and take revenge, or be tested on,” while “Scientists 🔬 - Create your OWN mutations and test them on lab rats.” Security stops escapes and captures escaped rats — it does not mutate anyone. The Scientist’s signature tool is the mutation gun — “Your job tool (Scientists, Mutations)” — with the discipline note: “Science identity. Ammo discipline beats spray.”

Roadmap

1. 1

   Claim a workspace

   Spawn and know which rooms are still powered and usable after the latest patch.

   • Pick a room confirmed usable under the current patch.
2. 2

   Check the Index UI

   Confirm colour meanings before you tag allies or rats incorrectly.

   • Open the Mutation Index and read what each colour currently means.
3. 3

   Unlock tools in-session

   Get the mutation gun first if it is contested; hazmat if the wing is toxic or unstable.

   • Prioritize the mutation gun when contested.
   • Grab a hazmat suit for toxic or unstable wings.
4. 4

   Read the breach

   If Lab Rats are mid three-stage escape, decide contain vs ignore based on your objective timer.

5. 5

   Respect Security lanes

   Call positions; do not steal their net kills if you still need a living subject.

6. 6

   Extract value before death

   A dead scientist with zero Index progress wasted the join.

In gameplay footage, the creation beat reads the same way each time: pick the mutation and its colour (“What color do we want it? I’ll make it”), grab a syringe, then inject the rat — “Oh my gosh, I’m mutating him.” This is the observed loop, not documented interface text, so treat the exact in-game labels as something to check live.

Mutation effects seen in gameplay

These effects were sighted in gameplay video as spoken player callouts — they are not verified in-game UI labels:

Tips

Blindness

“I just got rid of his eyes. I made him blind.”

Extra eyes and warts

“I got eyes all over me. I got warts.”

Spontaneous combustion / explosive

“What do you mean injecting me with spontaneous combustion? Supernova.” / “he’s explosive now”

Vampire

“Why am I a vampire at?”

Wireframe

“What the hell is wireframe?”

Reversed controls

“Everything’s reversed.”

Clown

“What does that do? Clown.”

Bulletproof gums

“Bulletproof gums cannot damage you.”

Cyclops

“Cyclops.”

Colour changes

“I’m infecting him, man. They’re ruining my color.”

Cosmetic / skin variants

Observed callouts: Homelander, FNAF (“Five Nights at Freddy’s”), Shadow Tail, Camouflage, Flower, Popcorn.

Named community callouts

Watch for odd silhouettes: Verity, and the Dwarfism / Tiny Verity combo — names spoken in video, not confirmed labels.

The caveat that matters: no complete in-game mutation list is documented, so treat this grid as a sample of observed play rather than a catalogue.

What mutations do to the Lab Rat being tested

For the rat, mutations arrive as statuses applied by a scientist: “mutation gun and Index colours change your effective HP and options.” The mutations guide frames the experience as “obstacle or opportunity depending on patch behavior and who holds OP access,” and lists ignoring “Mutation Index debuffs you do not understand” as a bad-revenge habit. One myth fails outright — vest HP still matters after a mutation, because “Vest HP and sniper rules still decide gunfights”: vest rats carry roughly +50 HP, and snipers one-shot non-vest rats.

Security reads the same board differently: “Treat mutation hotspots as vision traps.” Captures stay the job, and “If scientists cluster on Index goals, cover their flanks—or accept that revenge rats will farm them first.”

Tracking progress in the Mutation Index

The Mutation Index is the system’s tracking layer: “the Mutation Index uses colour/mutation markers to track specimens.” The markers record state — “Colours are statuses, not codes” — so the workflow below is about reading the Index, not redeeming it:

Mechanic flow

1. 1

   Open the Index first

   Open the Index before long experiment chains so you know your target mutation.

2. 2

   Log colours privately

   Log colour codes in a personal note if you are collecting — they are still not promo codes.

3. 3

   Decide on the gamepass

   Consider All Mutation Codes (R$2499) only if Index completion is your main reason to play — it is expensive compared to Hazmat (R$249) or Mutation Gun (R$299).

4. 4

   Re-check after patches

   Re-check Updates when Evil Science patches mutation behavior.

Mutation colour codes are not promo codes

Two differently named “code” systems get mixed up in searches, and only one of them touches mutations at all:

Comparison

Comparison

Name	What It Is	Where It Matters	Status / Cost
Promo codes	Gift redemption strings	Codes UI	None confirmed on Creator Exchange as of September 2026
Mutation Index colour codes	Specimen / mutation references	Mutation Index	Distinct list; All Mutation Codes gamepass R$2499

The All Mutation Codes gamepass (R$2499, launched 14 Sep 2026) “is NOT a promo code, NOT a free gift string list, and NOT proof that redeemable codes exist.” Two myths fail the same check: “This colour code gives free Sniper” is Index talk or a scam, and “‘Promo codes are hidden in the Mutation Index.’ — Different systems.” The getting-started rule: do not confuse promo codes with Mutation Index colour codes — those track mutations and may be accelerated by the All Mutation Codes gamepass.

Session timing: when mutations get dangerous

Mutation play rides the same session clock as every tool, and every unlock time here is a community-facing approximation that patches can nudge. Early session (5–15m) is first-experiment territory before the map fills with firearm chaos. Mid session (22–30m) is when rifles, traps, shotguns, and turrets redefine space — mutating in open labs invites deletion. By late session (~60m), “OP Mutations enter the conversation—plan fights and escapes differently once this tier is live.”

Data table

Approx Minute

30

Unlocks

Shotguns, Turret

Who Cares Most

Anchor defense; brutal close returns

Approx Minute

60

Unlocks

OP Mutations

Who Cares Most

Late chaos for science and combat

Data table

Approx Minute	Unlocks	Who Cares Most
30	Shotguns, Turret	Anchor defense; brutal close returns
60	OP Mutations	Late chaos for science and combat

The scientist clock note: “Treat minute sixty as a different game if OP mutations are active.” At ~60m “OP Mutations — both science toys and rat threats can spike,” and “late OP Mutations (~60m) change risk for everyone in the chamber.” The reset rule applies to the OP tier too: the claim that OP Mutations permanently unlock on your account after one hour is false — “Session unlocks reset without Forever passes.” The paid skip is OP Mutations Unlocked Forever, R$299.

Gamepasses tied to the mutation system

Five purchases touch mutation play:

• All Mutation Codes — R$2499, launched 14 Sep 2026. Index/code convenience at a premium; not promo redeem.
• Mutation Gun — R$299. The direct mutation gameplay tool.
• Hazmat Suit — R$249. Survivability while living in hazard spaces.
• OP Mutations Unlocked Forever — R$299. Skips the ~60m session wait for the OP tier.
• Forever tool unlocks — price varies. Skip repeating session timers for listed tools.

Buying guidance follows the session economy: buy after you understand free timers, because Rat Lab’s economy punishes impulse purchases more than most experience games — sessions reset progression clocks. All Mutation Codes is for Index completionists only; it is the premium outlier.

Badges connected to mutation play

The Scientist fantasy is to “apply mutations, study subjects, and keep the lab productive,” and three markers track it: For Science (experimentation milestone), New Specimen (Index / specimen progress), and the shared early marker Test Subject.

Mistakes to avoid

Problem

Expecting a promo code to skip badge progress

Fix

No promo codes granting badge skips are confirmed — progress comes from specimen work, so watch For Science, New Specimen, and Test Subject.

Problem

Grinding Index straight through an escape wave

Fix

Escape badges (Through the Wall, Out of the Lab) popping often means revenge will interrupt an Index session — plan around the interruption.

Problem

Buying All Mutation Codes (R$2499) as a redeemable promo pack

Fix

It is Index convenience for completionists, not a redeemable code pack.

Mistakes to avoid

Problem	Fix
Expecting a promo code to skip badge progress	No promo codes granting badge skips are confirmed — progress comes from specimen work, so watch For Science, New Specimen, and Test Subject.
Grinding Index straight through an escape wave	Escape badges (Through the Wall, Out of the Lab) popping often means revenge will interrupt an Index session — plan around the interruption.
Buying All Mutation Codes (R$2499) as a redeemable promo pack	It is Index convenience for completionists, not a redeemable code pack.

Surviving mutation chambers

Chambers are the science zone — where Scientists push For Science / New Specimen — and they turn hostile fast:

Failure reasons

Problem

Standing still while interacting during rifle minutes

Fix

Strafe while interacting — standing still in a chamber during rifle minutes is free elo for Security.

Problem

Treating the chamber as safe because it farms Index progress

Fix

Keep an exit vector — the chamber that farms Index progress can become a revenge killbox.

Problem

Finishing a mutation cast where the gunfire started

Fix

Relocate after loud gunfire; do not finish a mutation cast in the same spot.

Problem

Shooting near experiments without warning

Fix

Friendly fire near mutation experiments can throw science rounds — call shots.

Failure reasons

Problem	Fix
Standing still while interacting during rifle minutes	Strafe while interacting — standing still in a chamber during rifle minutes is free elo for Security.
Treating the chamber as safe because it farms Index progress	Keep an exit vector — the chamber that farms Index progress can become a revenge killbox.
Finishing a mutation cast where the gunfire started	Relocate after loud gunfire; do not finish a mutation cast in the same spot.
Shooting near experiments without warning	Friendly fire near mutation experiments can throw science rounds — call shots.