Steal a Brainrot is a 2025 multiplayer video game developed by SpyderSammy released on Roblox. The game centers around buying and stealing Brainrots—characters drawn from the Italian brainrot memes. Owned by DoBig Studios, Steal a Brainrot is the only Roblox game to have surpassed 25 million concurrent users (CCU) and is the second to have surpassed 20 million CCU, the first being Grow a Garden. The game was popularized on social media, where users have shared strategy tips and viral clips of upset children who had lost their Brainrots.