Rat Lab Mutation Index Color Codes: What They Track (September 2026)
Rat Lab Mutation Index color codes are specimen markers, not redeemable promo codes. What they track, where the colors appear, and the R$2,499 mutation-codes gamepass — September 2026.
Mutation Index color codes in Rat Lab are per-mutation specimen references inside the science loop: they describe mutation states, experiment tags, and UI markers. They are not redeemable promo codes, and no working Rat Lab promo codes were confirmed as of September 2026. There is also no verified color-to-meaning table for the Index — color meanings are read live in the Mutation Index UI itself. Below: what the codes track, where the colors show up, how the All Mutation Codes gamepass (R$2,499) fits in, and why pasting them into the Codes redeem box does nothing.
Two "code" systems: promo codes vs. Index color codes
Players searching "Rat Lab codes" often mix two unrelated systems:
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 color codes | Specimen / mutation references | Mutation Index | Distinct list; All Mutation Codes gamepass (R$2,499) |
If a video title says "Rat Lab codes," pause and ask: is this a color code for the Index, or a claim about free Robux gifts? Paste Index codes into promo redeem and you will only get frustration.
What the color codes actually track
Mutation Index color codes are defined by what they track, not by any redeemable value. The Mutation Index uses color/mutation markers to track specimens, and the most specific framing from the game's Scientists documentation is: "Mutation Index color codes are not redeemable promo codes. They describe mutation states, experiment tags, or UI markers inside the science loop." The Tools Tier List compresses the same idea for gameplay — "Colours are statuses, not codes" — and even lists "Standing still to 'test' Mutation Index colours" as a C-tier mistake when escaping rats. Getting Started adds the progression tie: the color codes track mutations and may be accelerated by the All Mutation Codes gamepass (R$2,499). So the correct reading of any Mutation Index color entry is a per-mutation reference/status inside the science loop, not a gift key.
Where the colors appear and how they tie to Index progress
Colors surface in three documented places:
- The Mutation Index UI. Scientists are told to "Check Index UI — confirm colour meanings before you tag allies or rats incorrectly," and the mutations workflow says to "Open the Index before long experiment chains so you know your target mutation."
- Tagged rats. Lab Rats are pointed to what color statuses mean when a scientist tags them, with the reminder that those colors are not promo codes from the Codes Hub.
- Mutation-gun play. The tier list tells scientists to "Pair with Index colour literacy; never sell colours as promo codes."
The documented progress habit is note-keeping: "Log colour codes in a personal note if you are collecting — still not promo codes," and the scientist routine repeats "Log mutation colour codes you care about; never paste them into promo redeem."
The All Mutation Codes gamepass (R$2,499): what it is and is not
The phrase "mutation codes" also names a paid product: the All Mutation Codes gamepass. The Roblox pass listing (as relayed through Rolimons) prices it at R$2,499, launched 14 Sep 2026, with the description "Unlocks every mutation's colour code in the Mutation Index." Every wiki treatment classifies it the same way: a paid Index convenience pass — "It is NOT a promo code, NOT a free gift string list, and NOT proof that redeemable codes exist" — and the scientist guide notes it "accelerates Index access."
Buying advice from the codes coverage: consider All Mutation Codes (R$2,499) only if Index completion is your main reason to play; it is expensive compared to Hazmat (R$249) or Mutation Gun (R$299). Because the pass wording above comes through a third-party listing relay of the Roblox store page, confirm the live purchase modal before buying, since price and description wording can change.
Promo-code status (September 2026) and redeem-UI behavior
Promo-code status as of September 2026: none confirmed. The wiki homepage states "No working Rat Lab promo codes confirmed yet," the gamepass guide repeats "None confirmed working as of September 2026," and the escape guide notes "There are still no confirmed promo codes for free escape boosts. Ignore fake code lists."
Because Index codes are so often mistaken for redeem strings, Getting Started lists "Treating mutation codes as promo codes and spamming the redeem UI" among common beginner mistakes. The Scientists page is blunt about the outcome: "Typing a colour name into a Codes box will not gift Robux, Forever passes, or cosmetics," and a thumbnail promising "ALL MUTATION CODES 2026" as free cash "is almost certainly conflating systems on purpose." The codes hub's scam checklist asks the tell-tale question — are Mutation Index colours or the All Mutation Codes pass being sold as "secret promo codes"? They are not — and adds: "Never buy 'private codes' from strangers in chat. Real promos are free and public."
Documented color and mutation examples — and why there's no full color table
The only color-adjacent specifics any source commits to come from video material, and the wiki bounds them deliberately. Wiki pages name Verity and Dwarfism (Tiny Verity combo) as the "mutation names called out in video material," and instruct writers and players to "use what you observe live; do not invent a full colour bible" and "Do not invent a full Index colour list."
The gameplay footage itself shows colors being chosen as mutations are created ("What color do we want it? I'll make it Oh, that."), colors being grabbed and applied to specimens ("Let me grab this color. Looks pretty cool."; "I'm infecting him, man. They're ruining my color."), and one named pick captioned "Shadow Tail. Oh, that's pretty cool. Camouflage." Those observations reflect the builds recorded in the footage, not necessarily the current live build. No published color-to-meaning table exists; per the wiki's own caution, the mapping is left to live observation of the current Mutation Index.
Before you rely on this page
Rat Lab is actively patched (including a 19 Sep 2026 place push with thin public notes), and all statuses above are current to September 2026 snapshots. Color-code behavior, pass wording, and prices should be rechecked against the live Mutation Index and Roblox store, and the promo-code status can change on its own without any mutation-system update — so treat "none confirmed" as a dated status, not a permanent one.