Steal a Brainrot Mutations Guide (2026): Every Multiplier Explained
Quick Answer: Steal a Brainrot mutations are random visual variants that multiply a Brainrot's base income and trading value. The four core mutations are None (1×), Gold (1.5×), Diamond (2.5×), and Rainbow (5×), the rarest and most valuable. A mutation applies on top of rarity, so a Rainbow Common can genuinely out-value a plain Legendary — use the trading calculator to check exact mutated values.
What Are Mutations in Steal a Brainrot?
A mutation is a random variant that can appear on almost any Brainrot when it spawns, giving it a different look and a multiplier that boosts its income and trading value above the base rate.
Mutations apply independently of rarity — a Common can roll a mutation just as easily as a Secret can. That's exactly why the interaction between rarity and mutation is what actually decides most close trading calls, not rarity alone.
In my own trading experience, this is the single most overlooked factor when players size up a deal. Always ask "what mutation is it?" before assuming a plain higher-rarity item automatically beats a mutated lower-rarity one. You can see mutations spawn in real time on the official Steal a Brainrot Roblox page.
All Mutations Explained
None
The default, unmutated version of a Brainrot. Most conveyor spawns come out this way — no visual variant, no bonus multiplier.
Gold
A golden-tinted variant and the most common mutation to actually see in a session. It gives a modest but noticeable boost over a plain item.
Diamond
A crystalline, ice-blue variant that's rarer than Gold. At 2.5×, a Diamond-mutated item can meaningfully close the value gap with the next rarity tier up.
Rainbow
The rarest and most sought-after of the four, cycling through visible rainbow colors. At 5×, a Rainbow mutation can push even a Common well past a plain Rare or Epic in trading value.
Mutation Multiplier Table
| Mutation | Multiplier | Example ($10K base item) |
|---|---|---|
| None | 1× | $10K |
| Gold | 1.5× | $15K |
| Diamond | 2.5× | $25K |
| Rainbow | 5× | $50K |
How to Get a Mutation
Mutations roll randomly when a Brainrot spawns on the conveyor or is obtained through a Lucky Block — there's no way to force a specific one on demand through normal play. Rainbow is the hardest to land naturally, which is exactly why it commands such a high premium in trades.
Some special in-game events have introduced additional, limited-time variants beyond these four core mutations, occasionally with even steeper multipliers. Because these are event-specific and not always confirmed to persist, this guide and our calculator track the four core mutations above — always double-check anything unfamiliar in-game before trading around it. Steal a Brainrot's mutation system has evolved alongside the game's broader growth since its 2025 release, so expect occasional additions.
Mutation vs. Rarity: Don't Confuse Them
Rarity and mutation are two separate systems that both affect a Brainrot's worth. Our full rarity guide covers tiers in depth, but the short version:
- Rarity is fixed per Brainrot and rarely changes — it's the base tier (Common through OG)
- Mutation is random and applies on top of rarity, multiplying the base value
A Gold-mutated Legendary and a plain Mythic can end up surprisingly close in value — that's the kind of comparison that's easy to get wrong without checking both factors.
How Mutations Affect Trading Value
Every value on our value list is shown as a base number with no mutation applied. To get the real trading value, multiply that base number by the mutation's rate from the table above.
For multi-item trades where mutations are mixed across several Brainrots, doing this by hand gets error-prone fast — the trading calculator handles the math automatically so you can focus on the deal itself.
Common Mistakes with Mutations
- Assuming a plain higher-rarity item always wins — a Rainbow-mutated lower-tier item can beat it outright
- Not verifying the mutation in-game before trading, relying only on a description or blurry screenshot
- Confusing mutation with rarity when negotiating — they're separate systems and both need to be checked
- Overpaying for Gold thinking it's rare — Gold is the most common mutation you'll actually encounter
Frequently Asked Questions
What is the best mutation in Steal a Brainrot?
Rainbow is the best and rarest of the four core mutations, multiplying a Brainrot's base value by 5×.
How rare is a Rainbow mutation?
Rainbow is by far the hardest of the four to land naturally, which is why Rainbow-mutated Brainrots carry a significant trading premium over the same item with no mutation.
Can you choose which mutation a Brainrot gets?
No — mutations roll randomly when a Brainrot spawns or is obtained from a Lucky Block. There's no confirmed way to guarantee a specific mutation through normal play.
Does mutation affect income per second as well as trading value?
Yes. A mutation's multiplier applies to both a Brainrot's income per second and its overall trading value, since trading value is largely derived from that income.
Is Gold or Diamond better?
Diamond is better, at a 2.5× multiplier compared to Gold's 1.5×. Diamond is also rarer to obtain than Gold.
Key Takeaways
- Four core mutations exist: None (1×), Gold (1.5×), Diamond (2.5×), and Rainbow (5×)
- Mutations apply on top of rarity, not instead of it
- Rainbow is the rarest and most valuable mutation, hardest to land naturally
- Mutations roll randomly on spawn — there's no way to force a specific one
- Always verify a Brainrot's mutation directly before trading, not just its rarity label