Sigma Boy
Legendary tier brainrot in Steal a Brainrot
About Sigma Boy
Sigma Boy is a legendary-tier brainrot in Steal a Brainrot, the Roblox collection-and-trading game where every pet generates passive income and can be upgraded with mutations and traits. At base, Sigma Boy earns $1.4K/s and costs $325.0K from the in-game shop — those numbers are the floor, before any multiplier from mutations or trait stacking is applied.
For trade evaluation, divide the USD value by your offer's value to get a clean ratio. The trade calculator does this automatically and applies trait amplifiers (Brilliant, Sniper, etc.) which add to base income additively rather than multiplicatively. See the methodology page for how the valuation algorithm actually computes these numbers, or the trade-valuation guide for a step-by-step walkthrough.
Background & lore
Source: Steal a Brainrot Wiki ↗Sigma Boy is an animal-food hybrid brainrot. It consists of a penguin related with sushi. Its appearence consists of a penguin. It can be seen having its torso replaced by an oversized sushi, while having seaweed covering the middle. It can be seen having a Salmon Nigiri on top of its head.
Trivia
- Sigma Boy is one of the only Brainrots with an English name, along with Tim Cheese, Strawberry Elephant, Blackhole Goat, Cupcake Koala, Sigma Girl, Money Money Puggy and the Lucky Blocks.
- Its chance is about 0.132%, (2/1515)
- This brainrot was equipped to craft Sigma Girl, but the Brainrot Trader was removed by Santa's Fuse
- This brainrot has a variant called “Sigma Girl”.
- This is RustyNickle40's favorite Brainrot.
Background content sourced from the community-maintained Steal a Brainrot Wiki under CC BY-SA 3.0. rot.rocks is not affiliated with the wiki or with Roblox.
Trade Sigma Boy
Want to trade this brainrot? Post an offer on the rot.rocks trading marketplace, or run the numbers through the trade calculator before you commit to a deal.