Radioactive mutation: 8.5x income, how to get it
By multiplier it is number 8 of 15 mutations, where 1 is the highest.
Formula follows the wiki's worked examples. Not verified in game.
Radioactive mutation facts
| Multiplier | 8.5x |
|---|---|
| Type | Event mutation (Limited on the wiki) |
| In game since | Nov 15, 2025 |
| Appears during | Radioactive event |
| Event ran every | 30 minutes |
| Admin Abuse | Needed to obtain it, per the wiki |
A brainrot carries one mutation at a time, and the wiki says collecting 75% (3 of 4) of the obtainable brainrots in one mutation unlocks a base skin.
Worked example with a $65M/s brainrot
| Setup | Multiplier | Income |
|---|---|---|
| No mutation | 1x | $65M/s |
| Radioactive | 8.5x | $552.5M/s |
| Radioactive + Fire | 13.5x | $877.5M/s |
| Radioactive + Fire + Nyan | 18.5x | $1.2025B/s |
The example brainrot is Ventoliero Pavonero, the one the wiki uses on its Mutations page. Multiplier = mutation + traits, income = base x multiplier. Fire and Nyan are 5x each.
Nearby mutations
All mutations and traits · Calculate with Radioactive
Questions
What does the Radioactive mutation do to income?
It sets the mutation part of the multiplier to 8.5x. For the wiki's $65M/s example brainrot that is $552.5M/s alone, $877.5M/s with Fire (5x) and $1.2025B/s with Fire and Nyan. Traits are added to the mutation, not multiplied with it. This follows the wiki's examples and is not verified in game.
How do I get the Radioactive mutation?
The wiki says there is a mild chance that it applies to a brainrot during the Radioactive event. The event used to run every 30 minutes. The wiki says it is unobtainable without Admin Abuse.
When was the Radioactive mutation added?
The wiki says it has been in the game since Nov 15, 2025.
Source: Steal a Brainrot Wiki: Mutations (rev 189024, Oct 14, 2026), Template:MutationText (rev 186393, Oct 3, 2026), Template:BrainrotFormula (rev 161404, Jul 9, 2026). Licence: CC BY-SA 3.0. Facts were restructured and the numbers recalculated here; the text is our own and no wiki images are used. Changes were made. Checked Oct 15, 2026. Not affiliated with Roblox Corporation or the developers of Steal a Brainrot.