Mutations in Steal a Brainrot are one of the most powerful features in the game.
They act as special upgrades that boost your Brainrots’ income multipliers, meaning your money-making potential skyrockets without needing to spend extra cash.
Whenever a Brainrot rolls out on the conveyor belt, there’s a small chance it spawns with a mutation.
These mutations not only change the Brainrot’s appearance but also multiply how much income it generates per second. The rarer the mutation, the higher the multiplier.
Here’s the complete and updated Mutation Tier List for October 2025, ranking every mutation from S-Tier to D-Tier based on performance, availability, and overall earning potential.
Complete Steal a Brainrot Mutation Tier List (October 2025)
Mutations are randomly assigned to Brainrots on the conveyor belt.
You can’t control when they appear, but you can improve your odds by purchasing Server Luck (costs 249 Robux).
During special events, admins may also activate systems like the Rainbow Machine, temporarily boosting mutation chances or unlocking admin-only types.
Below are all the mutations ranked by tier, along with their multipliers and availability.
S-Tier Mutations
These are the most powerful mutations in the game. They have the highest multipliers and are fully available (or occasionally admin-triggered) during special events.
| Mutation | Multiplier | Status |
|---|---|---|
Rainbow |
10x | Available |
| Strawberry | 8x | Available |
Yin Yang |
7.5x | Available (trigger only) |
Why S-Tier:
Rainbow and Strawberry mutations dramatically boost your earnings, especially when placed on Secret or God-tier Brainrots.
Yin Yang is slightly rarer and can only be triggered during specific events, but it’s still one of the top multipliers.
A-Tier Mutations
A-tier mutations are solid upgrades that can multiply income up to six times.
They’re not as flashy as S-tier ones, but are far more common and reliable for consistent earnings.
| Mutation | Multiplier | Status |
|---|---|---|
Lava |
6x | Available |
| Glitch | 6x | Available (trigger only) |
Galaxy |
6x | Available |
Why A-Tier:
These are dependable, event-friendly mutations that you’ll encounter often.
Lava and Galaxy, in particular, are favorites for mid- to high-tier Brainrots thanks to their accessibility and stable multipliers.
B-Tier Mutations
Admin-triggered mutations that are rarely available.
They look great visually but are not obtainable under normal gameplay conditions.
| Mutation | Multiplier | Status |
|---|---|---|
| Celestial |
4x | Admin trigger only |
Candy |
4x | Admin trigger only |
Why B-Tier:
Celestial and Candy were mainly seen during limited admin events like Witch Fuse or special Halloween triggers.
They perform well but are impossible to get unless an admin activates them.
C-Tier Mutations
C-tier mutations are weaker in terms of performance and usually appear only through admin triggers.
They have low multipliers and aren’t worth prioritizing unless they appear on a rare Brainrot.
| Mutation | Multiplier | Status |
|---|---|---|
Bloodrot |
2x | Admin trigger only |
Why C-Tier:
While Bloodrot fits the Halloween aesthetic perfectly, it doesn’t add much to your income compared to higher-tier mutations.
D-Tier Mutations
These are the most common and least powerful mutations.
However, even these can be useful if attached to expensive or high-tier Brainrots.
| Mutation | Multiplier | Status |
|---|---|---|
Diamond |
1.50x | Available |
Gold |
1.25x | Available |
Why D-Tier:
Though low in power, they’re always available.
A Diamond mutation on a Secret-tier Brainrot can still outperform a standard one without any mutation.
How to Get Mutations in Steal a Brainrot
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Buy Brainrots from the Conveyor: Every Brainrot that spawns has a small chance to carry a random mutation.
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Activate Server Luck: Increases your odds of seeing mutations.
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Join Events: Admin events often boost mutation rates or unlock exclusive variants like Yin Yang or Celestial.
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Check for Mutations Before Buying: Mutated Brainrots glow or have visible color changes, so keep an eye out before they disappear from the belt.
SEE ALSO:
Taco Tuesday Time in Steal a Brainrot
All Witch Fuse Brainrots in Steal a Brainrot (Full List & How It Works)
How to Get Los Mobilis in Steal a Brainrot
How to Use Witch Fuse in Steal a Brainrot (Halloween Update Guide)
Tips for Mutation Farming
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Always Buy High-Mutation Brainrots: Even if it’s not S-tier, a Gold mutation on a Secret Brainrot will still generate impressive profits.
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Watch for Live Updates: Developers frequently trigger random mutation boosts during updates or special weekends.
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Be Patient: Mutations are luck-based — persistence pays off.
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Save Robux for Server Luck: It’s the most efficient way to maximize your drop rates long-term.
Final Thoughts
Mutations are what separate regular players from top earners in Steal a Brainrot.
If you manage to get a Rainbow, Strawberry, or Yin Yang mutation, hold on to it, these can multiply your earnings tenfold.
Still, even lower mutations like Diamond or Lava can make a huge difference when paired with rare Brainrots.
Keep watching the conveyor, use Server Luck, and join events, that’s how you build a base that prints money nonstop.
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