Medusini and Demonini

Medusini and Demonini 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, Medusini and Demonini earns $180.0M/s and costs $165.0B 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, Medusini and Demonini prices currently range from $35 for the Default variant up to $42 for Diamond. Mutation multipliers compound on the base income, so the same Medusini and Demonini body at a higher-tier mutation out-earns its Default variant by exactly that ratio per second.

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.