What is the rarest Brainrot?

Currently, the OG rarity is the highest, surpassing Secret. Examples typically include event-specific Brainrots.

How do I get Brainrots?

You can purchase them from the conveyor or steal them from other players' bases if they are unlocked.

What is Steal a Brainrot?

Steal a Brainrot is a thrilling Roblox game by BRAZILIAN SPYDER where you collect brainrots, build wealth, and compete on the leaderboard.

How does the fusion system work?

You can use the Fuse Machine to combine two brainrots and create new, rarer brainrots. Special fusion machines like Santa's Fuse and Witch Fuse offer unique combinations.

Arca Bros

Secret

THEMED

Base Cost

$250.0B

Income per Second

$250.0M

Efficiency

0.10%

Event

Spooky Skeletons — Update 71

Arca Bros is a Secret Brainrot introduced with Halloween Part 2 in Steal a Brainrot. Its baby dragon and baby octopus each have a purple arcade cabinet built into their bodies. Redeeming its merchandise DLC adds a duo with $250M/s base income to your collection.

Secret brainrot generating $250.0M/second

Obtainable by redeeming an eligible merchandise DLC code.

How to get it Calculate income Notable facts Related routes

Identity & Availability

Quick Answers

What is Arca Bros?

Arca Bros is a Secret brainrot in Steal a Brainrot through Themed Brainrots. It generates $250M/s and has a listed base cost of $250B.

How do you get Arca Bros?

Current availability for Arca Bros: Obtainable by redeeming an eligible merchandise DLC code.

When was Arca Bros added to Steal a Brainrot?

Arca Bros has a recorded game-added date of October 17, 2026.

Release Status

Released

Primary Route

Themed Brainrots

Event Source

Spooky Skeletons

Visual Structure

Composite (2 parts)

Added to Game

October 17, 2026

Current Availability

Obtainable by redeeming an eligible merchandise DLC code.

How to Obtain

THEMED

Special themed brainrots from event activities.

Purchase

Redeem an eligible merchandise DLC code in the Codes menu.

Steal

Check the current in-game stealing rules before attempting a steal.

Pro Tips

Check the reward attached to your merchandise code before redeeming.

Visual Structure

Prototype

Structured prototype tags extracted from the brainrot's identity and visual design.

DragonOctopusArcade Cabinet

Composition

Duo

Composed of 2 entities

Referenced component types:

Collection Tip: This character contains 2 entities based on Arcadragon and Arcadopus. Collect Arca Bros to boost your progress!

Notable Facts

Arca Bros pairs baby versions of Arcadragon and Arcadopus.

Mutation Income Calculator

Select Mutation

Time Period

Income with Default mutation

900.0B/h

Base: $900.0B/h → +0%

View all mutations at hourly rates

Mutation	Mult	Income
Default	1x	$900.0B
Gold	1.25x	$1.1T
Diamond	1.5x	$1.3T
Rainbow	10x	$9.0T
Bloodrot	2x	$1.8T
Celestial	4x	$3.6T
Candy	4x	$3.6T
Lava	6x	$5.4T
Galaxy	6x	$5.4T
YinYang	7.5x	$6.7T
Radioactive	8.5x	$7.6T
Cursed	9x	$8.1T
Divine	10x	$9.0T
Cyber	11x	$9.9T
Phantom	12x	$10.8T
Crystal	13x	$11.7T