4th Bros: income, cost and where it came from
Formula follows the wiki's worked examples. Not verified in game.
By base income it is number 231 of 338 Secret brainrots with a stated income on the wiki, where 1 is the highest and ties share a rank. It pays for itself in 3.6 min with no mutation. The wiki names: Red Carpet.
4th Bros facts
| Rarity | Secret |
|---|---|
| Income per second | $3.75M/s |
| Cost | $800M |
| Payback time | 3.6 min |
| Rank among Secret | 231 / 338 |
| Released | Update 56, Jul 4, 2026 |
| Availability | unobtainable |
| Comes from | Red Carpet |
| Wiki notes | spawned only once |
4th Bros income with mutations
| Mutation | Multiplier | Income per second |
|---|---|---|
| Default | 1x | $3.75M/s |
| Gold | 1.25x | $4.6875M/s |
| Diamond | 1.5x | $5.625M/s |
| Rainbow | 10x | $37.5M/s |
| Cyber | 11x | $41.25M/s |
| Eclipse | 14x | $52.5M/s |
| Eclipse + Fire + Nyan | 24x | $90M/s |
Multiplier = mutation + traits, income = base x multiplier. Fire and Nyan are 5x each. 15 mutations exist; the table shows the main ones.
Nearby brainrots
- Next higher income in Secret: Chill Puppy ($4M/s)
- Next lower income in Secret: Chicleteira Bicicleteira ($3.5M/s)
Brainrot income list · Calculate with 4th Bros · Traits and mutations
Questions
Why is 4th Bros not obtainable?
4th Bros has a base income of $3.75M/s. The wiki marks it unobtainable. The wiki describes it as: spawned only once. It came in Update 56 on Jul 4, 2026.
Where does 4th Bros come from?
For 4th Bros, the wiki names: Red Carpet. It arrived in update 56 (Jul 4, 2026). The wiki marks it unobtainable.
When was 4th Bros released?
The wiki lists Update 56, which went live on Jul 4, 2026.
Source: Steal a Brainrot Wiki: 4th Bros (rev 185735, Oct 2, 2026), Update Log (rev 188265, Oct 11, 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.