Marino Submarino

Marino Submarino 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, Marino Submarino earns $3.6M/s and costs $775.0M 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, Marino Submarino prices currently range from 199 Robux for the Default variant up to 239 Robux for Diamond. Mutation multipliers compound on the base income, so the same Marino Submarino body at a higher-tier mutation out-earns its Default variant by exactly that ratio per second.

For trade evaluation, divide the Robux 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.