Steal a Brainrot Radioactive Mutation Update: Release Date, Features & Countdown

By Anish | Updated: November 15, 2025

The Steal a Brainrot Radioactive Mutation Update is finally arriving, and it’s easily one of the biggest content drops of 2025. With glowing radioactive brainrots, brand-new secrets, a full trading system, hourly fishing events, and nearly a week of gameplay opportunities, this update is packed with fresh mechanics and exclusive collectibles.

Below, you’ll find the exact release date, global timings, countdown, and a full breakdown of everything coming to the Radioactive Mutation event.

???? Steal a Brainrot Radioactive Mutation Update — Release Date & Time

The Radioactive Mutation Update officially launches on:

???? Saturday, November 15, 2025
⏰ 12:00 PM PT

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The update brings a new mutation mechanic, fresh brainrots, the Brainrot Trader, and hourly fishing events that will run throughout the event period.

???? Global Release Time (Region-Wise)

The event ends on:

???? Saturday, November 21, 2025 — 9:00 AM PT

This gives you nearly 6 full days to collect all radioactive brainrots, use trading features, and participate in the fishing cycles.

⏳ Countdown to the Radioactive Mutation Update

If you’re reading this before the update goes live, the wait won’t be long.
Watch the countdown below to see exactly when the event begins.

Once the event is live, your timer will automatically switch to a “Now Live” display.

???? What’s New in the Radioactive Mutation Update?

This is one of the most ambitious event updates Steal a Brainrot has ever done. Here’s everything arriving with the Radioactive Mutation event:

???? 1. Radioactive Mutations (Glowing Variants)

You can now mutate your brainrots with a green radioactive glow, giving them a unique, toxic appearance. This includes:

• Radioactive glow skins
• Mutation-exclusive cosmetics
• A special radioactive spin wheel
• Chance to obtain a radioactive secret block
• New radioactive gears to hunt for
• A full Radioactive Index to complete

Collectors will especially love finishing the new index, since some mutations will be limited to this event window only.

???? 2. New Brainrots to Collect

The update introduces NEW high-rarity brainrots:

• Centrucci Nuclucci (Mythic)
• Swag Soda (Secret)
• Additional unrevealed Secret rarity brainrots

Some of these may only be available through mutations, fishing, or trader cycles—so staying active during the event is crucial.

???? 3. Brainrot Trader (Restocks Every 2 Hours)

The Brainrot Trader is a brand-new feature that changes the way players collect brainrots.

You can:

• Trade unwanted brainrots for completely new ones
• Exchange duplicates instead of scrapping them
• Wait for fresh offers every 2 hours

This system gives you more control over your collection and helps complete indexes without relying only on luck.

???? 4. Hourly Fishing Events (Catch Brainrots!)

Every single hour during the event, a fishing event begins.

You can:

• Fish for rare brainrots
• Use upgraded fishing rods for better luck
• Complete the new Aquatic Index
• Find exclusive water-themed variants

This gives players 60 chances per day to catch event-specific brainrots.

???? How Long Does the Event Last?

You have almost a full week to complete:

• Radioactive Index
• Aquatic Index
• Trader rotations
• Fishing cycles
• Mutation unlocks
• Limited-time secrets

With hourly and two-hour cycles, checking the game frequently increases your chance to get the rarest brainrots.

???? Conclusion: The Biggest Brainrot Event of 2025

The Steal a Brainrot Radioactive Mutation Update is loaded with massive features that completely shake up gameplay. Whether you’re a collector, trader, or casual player, this event gives you more ways than ever to build your dream brainrot collection.

Stay active, watch the countdown, and jump in as soon as the update drops!

❓ Frequently Asked Questions (FAQ)

1. When is the Steal a Brainrot Radioactive Mutation Update releasing?

It launches on November 15, 2025, at 12:00 PM PT.

2. When does the event end?

The event ends on November 21, 2025 at 9:00 AM PT.

3. What are radioactive mutations?

They are glowing green variants of existing brainrots, obtainable through mutation mechanics and event features.

4. How often does the Brainrot Trader refresh?

Every 2 hours.

5. How often do fishing events happen?

Every hour throughout the event.

6. Are there new brainrots in this update?

Yes—Centrucci Nuclucci (Mythic), Swag Soda (Secret), and several unrevealed Secret brainrots.