Steal a Brainrot has five mutations and six traits, and the whole system runs on one formula:
income = base income x (mutation + every trait added together)
One mutation per brainrot. Traits stack. And because the terms add, a trait’s value never changes with the mutation it sits next to, which is the part most guides get wrong.
Every mutation
| Mutation | Multiplier | Where it comes from |
|---|---|---|
| None | 1x | A plain carpet roll |
| Gold | 1.25x | Natural carpet roll |
| Diamond | 1.5x | Natural carpet roll |
| Rainbow | 10x | Natural carpet roll |
| Eclipse | 14x | Eclipse event, carpet spawns only |
The gap between Diamond (1.5x) and Rainbow (10x) is the entire game. Gold and Diamond are rounding errors; Rainbow is a different unit.
Eclipse is the best mutation in the game at 14x, and it is also the most restricted: it only rolls on carpet spawns during the Eclipse event, which runs hourly on weekends and every two hours on weekdays. Each Eclipse start also grants one free wheel spin.
A worked example from the sources: an Eclipse Frigo Camelo earns $28K/s, because 2,000 x 14 = 28,000. That beats every unmutated Mythic in the game, which is the clearest illustration of how lopsided the multiplier curve is.
Every trait
| Trait | Bonus | Where it comes from |
|---|---|---|
| Fire | +5 | Admin Abuse weather |
| Comet-struck | +2.5 | Starfall weather |
| Snowy | +2 | Snow weather |
| Taco | +2 | Admin Abuse weather |
| Wet | +1.5 | Rain weather |
| Sleepy | x0.5 on the total | Random |
Two things stand out. Fire is the best trait by a wide margin at +5, twice the next best. And Sleepy is the only trait that multiplies rather than adds: it halves the final total, so a Sleepy brainrot is worse than a plain one no matter what else is on it.
That makes Sleepy the one trait you actively want to avoid, and it is why a Sleepy Rainbow (10 x 0.5 = 5x) is worse than a plain Diamond on a bad day.
Weather is the trait clock
Traits are not bought or crafted. They come from weather, which rolls every 15 minutes:
| Weather | Trait it grants |
|---|---|
| Starfall | Comet-struck (+2.5) |
| Snow | Snowy (+2) |
| Rain | Wet (+1.5) |
So a trait is a window, not a resource. If you are holding a good carpet spawn and Starfall is about to roll, waiting is worth +2.5 on that unit forever.
Admin Abuse sessions add Fire and Taco to the pool through admin-only weather, which is why Fire is rare outside those sessions.
The additive rule, in dollars
Because the formula adds, a trait adds a fixed amount of multiplier regardless of the mutation. In dollars:
| Unit base | Fire (+5) adds per day |
|---|---|
| $1/s | +$432K |
| $6.5K/s (Tigrilini Watermelini) | +$2.8B |
| $250M/s (Arca Bros) | +$108T |
The percentage is bigger on the cheap unit. The money is not. Traits belong on your highest-base brainrot, whatever mutation it already has.
The same logic decides where a mutation goes. With a fixed pool of modifiers, stacking them on the best unit always wins:
- Gold + Comet-struck on one $2,000/s unit: 2,000 x (1.25 + 2.5) = $7.5K/s
- The same two modifiers split across two $2,000/s units: 2,000 x 1.25 + 2,000 x 2.5 = $7.5K/s
Identical totals, because addition is commutative and both units have the same base. The split only loses when the bases differ, and then it loses badly: put both on the bigger unit.
Why guides disagree on Fire
Some sources write Fire as 6x and then subtract one inside the formula. That is the same arithmetic as +5 written as an addition, and it produces the same number. If a guide tells you Fire is 6x, it is not wrong, it is just using the multiplicative notation for an additive system.
The one place the notation matters is when you stack two traits. Fire (6x, minus one) plus Comet-struck is +5 +2.5 = +7.5, not 6 x 2.5. If you multiply the two “multipliers” you will overestimate every stacked unit you own.
The one rule that beats all of this
Traits can only be picked up on the carpet. Once a brainrot is home, it cannot gain a new trait.
So the decision point is not “what do I put on my best unit later”, it is “do I wait for weather before this unit walks home”. A Rainbow that walks during Starfall is permanently better than an identical Rainbow that walked ten minutes earlier.
Where to go next
- Steal a Brainrot calculator: put these numbers on your own floor.
- Values list: every OG and Secret with its base income.
- Lucky Blocks and Admin Abuse: where Fire and the event mutations actually come from.
Sources & last checked
Last checked: November 9, 2026 (game data current to Update 69, October 3, 2026).
- steal-brainrot.co beginner guide - mutation and trait tables, the additive formula, the Gold plus Comet-struck worked example, weather roll timing, Eclipse event schedule
- steal-brainrot.co - the Rainbow 10x and Fire +5 example, carpet-only trait rule
- steal-a-brainrot.org - mutation and trait overview
Frequently asked questions
What is the best mutation in Steal a Brainrot?
Eclipse at 14x, which only rolls on carpet spawns during the Eclipse event. Rainbow at 10x is the best one that comes from a normal carpet roll. Gold is 1.25x and Diamond is 1.5x.
How much is the Fire trait worth in Steal a Brainrot?
Fire is +5, added to the mutation rather than multiplied. Some guides write it as 6x and subtract one in the formula, which gives the same result.
Can a brainrot have more than one mutation?
No. One mutation per brainrot, but traits stack, and the formula adds every trait to the mutation value.
How do you get traits in Steal a Brainrot?
Traits come from the weather, which rolls every 15 minutes: Starfall gives Comet-struck (+2.5), Snow gives Snowy (+2) and Rain gives Wet (+1.5). A brainrot can only pick up a trait while it is on the carpet.