Roblox Steal a Brainrot Goes Nuclear: Radioactive Mutation Update Release Date, Time, and Must-Know Details
Roblox sensation Steal a Brainrot is about to go nuclear as the Radioactive Mutation Update drenches Brainrots in a sleek, glowing green makeover and tees up a slate of fresh events.
If your Steal a Brainrot conveyor belt has been looking a little bland, it’s about to go neon. The next drop is the Radioactive Mutation Update, and yes, the Brainrots are literally going glow-in-the-dark green. That’s the headline, but there’s a lot more tucked in here than a paint job.
When it goes live (and how long it sticks around)
The Radioactive Mutation Update is scheduled to launch on November 15 at 12:00 PM PT (8:00 PM UTC). The content is slated to run through November 21, with the event wrapping at 9:00 AM PT that day. Translation: you’ve got almost a week to mess with all the new toys.
- United States: 3:00 PM ET on Nov 15
- Europe: 9:00 PM CET on Nov 15
- Brazil: 5:00 PM BRT on Nov 15
- Japan: 5:00 AM JST on Nov 16
- China: 4:00 AM CST on Nov 16
- Philippines: 4:00 AM Manila Time on Nov 16
- Australia: 7:00 AM AEDT on Nov 16
- New Zealand: 9:00 AM NZDT on Nov 16
- India: 1:30 AM IST on Nov 16
Pro tip: hop in at least an hour early if you can. If everyone hits the servers at once, queues and disconnects tend to happen. This is a chunky update, so give yourself a buffer.
What the Radioactive Mutation actually adds
The obvious bit: the new Radioactive Mutation turns Brainrots green and glowy. It’s a full cosmetic mutation, not just a filter. If you’ve been waiting for the game to get weird again after a quiet stretch, this is that swing.
There’s also a new Radioactive Spin Wheel. On it: a Radioactive Secret Block plus fresh gear items. If you’re the type who loves limited-time wheels and the dopamine hit of a rare drop, you know the drill.
Indexes are expanding too. A dedicated Radioactive Index is being added, and there’s an Aquatic Index you can unlock by collecting every Aquatic Brainrot during the new event (more on that in a second).
A new Brainrot Trader is moving in. You can swap older Brainrots for newer ones, and the shop restocks with fresh offers every 2 hours. That 2-hour restock cadence is nice if you hate waiting a whole day for rotations.
Yes, there’s fishing now. A Fishing Event will pop up every hour once the update is live, letting you fish for Brainrots. Rods are available at the event, and better rods increase your odds. Catch the full set of Aquatic Brainrots and you’ll complete the Aquatic Index.
Three new Brainrots are debuting on day one:
- Centrucci Nuclucci (Mythic)
- Swag Soda (Secret)
- Hidden Brainrot (Secret)
Developers are teasing more details as we close in on launch, but even at face value this is a lot: a mutation, a wheel, two indexes, a trader with 2-hour restocks, an hourly fishing loop, and three new Brainrots. For a limited run, that’s plenty to grind.
The bottom line
The update hits November 15 at 12:00 PM PT and runs until November 21 at 9:00 AM PT. Jump in early, expect packed servers, and get ready to turn the belt radioactive green. If you’re chasing collections, the hourly fishing plus the trader’s 2-hour refresh are going to be your best friends.