Sir Mangus

Sir Mangus is a secret-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, Sir Mangus earns $7.5M/s and costs $1.3B from the in-game shop — those numbers are the floor, before any multiplier from mutations or trait stacking is applied.

Across live Eldorado marketplace listings, Sir Mangus prices currently range from $0.5 for the Default variant up to $0.6 for Diamond. Mutation multipliers compound on the base income, so the same Sir Mangus body at a higher-tier mutation out-earns its Default variant by exactly that ratio per second.

Current market signals: demand is low, price trend is rising. An unusual combination — Sir Mangus has thin demand but its price has ticked up. Often signals a buff, a permanence change, or a small group catalyst. Watch the next few scrapes before treating the new price as the real floor.

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.