Mutations are the single biggest income multiplier in Steal a Brainrot, and after Update 47 the whole tier list shifted. Cyber came in at 11x and immediately became the new ceiling — but it's not the only path to top-tier earnings. I've spent real time testing and tracking all 14 mutations, and this guide ranks them by raw multiplier AND by how practically accessible they are. Because a 12x mutation you can never get is worth zero.
Tier S+ — 10x or Higher
| Mutation | Multiplier | How to Get | Status |
|---|---|---|---|
| Disco | 12x | Datamined, not yet released | Coming May/June 2026 |
| Cyber | 11x | Cyber Craft Machine + windowed event | Active now |
| Rainbow | 10x | 1% conveyor spawn during Rainbow Machine event | Permanent |
| Divine | 10x | Divine event window | Limited |
Disco is datamined at 12x and looks real, but it's not out yet as of April 2026. Until it drops, Cyber is your top priority, full stop. What sets Cyber apart from the other S+ entries is that you can actually plan around it — the Cyber Craft Machine plus published event windows make it the only 10x+ mutation in the game's history that has a reliable, repeatable method behind it. Rainbow is fantastic but you're at the mercy of a 1% conveyor spawn. Divine is essentially admin-gated. Cyber, you can schedule.
Tier A — 8–9x
| Mutation | Multiplier | How to Get |
|---|---|---|
| Cursed | 9x | Cursed event window |
| Radioactive | 8.5x | Radioactive event window |
These are rare-event mutations. They pop up once or twice a month, sometimes less. They're genuinely strong, but here's my honest take: if you don't already have a mid-tier Secret or higher to put them on, skip the event. An 8.5x multiplier on a weak base brainrot isn't going to move your income numbers in any meaningful way. Save the effort for when you have something worth mutating.
Tier B — 6–7.5x
- Yin Yang (7.5x) — Yin Yang event
- Galaxy (7x) — Galactic event
- Lava (6x) — Molten event
Mid-tier events run roughly weekly, which makes these the most practical first 6x+ mutations for newer players. Galaxy in particular was my first strong mutation before I had Cyber sorted, and it genuinely made a noticeable difference. These are worth chasing actively — just don't spend Robux on them once you have a reliable Cyber pipeline.
Tier C — Below 6x
- Candy (4x) — Candy Aurora event
- Bloodrot (2x) — Bloodmoon event
Honestly, once you have any Tier A or B mutation running, these stop mattering for income purposes. The only time I'd bother chasing a Candy or Bloodrot now is if I have a brainrot that already has all three trait slots filled and I'm just topping it off. They're transitional at best.
Tier D — Permanent and Conveyor
| Mutation | Multiplier | Spawn Rate |
|---|---|---|
| Diamond | 1.5x | 20.4% on conveyor |
| Gold | 1.25x | 10% on conveyor |
| Default | 1x | Standard spawn |
These appear naturally during regular play — you don't need to do anything special to get them. Don't spend active effort chasing Diamond or Gold. They're nice when they show up, but they're stepping stones, not destinations.
Cyber vs the Field — The Numbers That Actually Matter
The question I get most: how much does Cyber actually change my income on a real brainrot? Here it is on a Digi Narwhal:
| Mutation | Income/s |
|---|---|
| Default 1x | $3.2B/s |
| Diamond 1.5x | $4.8B/s |
| Galaxy 7x | $22.4B/s |
| Rainbow 10x | $32B/s |
| Cyber 11x | $35.2B/s |
The gap from Rainbow to Cyber looks small in percentage terms — about 10%. But when you stack 5+ Cyber Secrets against 5+ Rainbow Secrets, that 10% compounds into billions of extra income per minute. And the bigger gap is the practical one: Rainbow shows up at 1% conveyor spawn rate. Cyber you can specifically plan for every weekend.
What to Actually Chase — My Strategy Take
- Cyber is the must-have. The Craft Machine makes it the most reliably-obtainable top-tier mutation in the game's history. If you're not actively building toward Cyber windows, you're leaving a lot on the table.
- Rainbow is the smart fallback when you can't nail Cyber timing — it spawns naturally so there's no event to miss.
- Divine is essentially admin-gated. Treat it as a bonus if it lands on something, not as an active goal.
- Once you have a confirmed Cyber pipeline working, skip everything below 6x. Your time is better spent on the next Cyber craft than chasing Candy or Bloodrot.
