Become the Biggest Brainrot is a Roblox experience where you train to grow larger and rebirth for extra power, and codes give you free Size boosts to speed that up.
Updated: December 16, 2025
New codes: Update4, 5MVisits, Speed
Update4— Free Size boost to help you grow faster NEW5MVisits— Free Size boost to celebrate 5 million visits NEWSpeed— Free Size boost themed around movement speed NEWUpdate3— Free Size boost to support the Update 3 patch
How to redeem codes
Step 1: Open Roblox and launch the Become the Biggest Brainrot experience from its game page.
Step 2: Once you load into the game, look at the right side of your screen and click the Shop button.
Step 3: In the Shop window, scroll down until you see the Codes section with a text box labeled “Enter code”.
Step 4: Carefully type or paste one active code into the box, matching all capital letters exactly.
Step 5: Click the green Redeem button to claim your reward; if the code is valid, the Size boost is added instantly.
Expired codes
1MVisits— Former milestone code for an earlier visit goal
Why codes might not work
- The code has expired and is no longer accepted by the game.
- There is a typo, missing character, or extra space; all codes are case-sensitive and must match exactly.
- The code was already redeemed once on your Roblox account, so it cannot be used again.
- The server you are on is not fully updated; rejoin the experience or restart Roblox and try redeeming again.
Where to find more codes
New Become the Biggest Brainrot codes are usually tied to updates, milestones, or events. To catch future codes quickly, you can:
- Join the official The Biggest Brainrot Roblox community group and watch the announcements section.
- Check the game’s Roblox page regularly for update notes and code mentions.
Bookmark this page — code lists are reviewed and refreshed regularly so you can stay current with new rewards.
Remember that Become the Biggest Brainrot codes are free, time-limited bonuses. They are case-sensitive, can stop working without warning, and should only be redeemed in-game or through official Roblox pages. Avoid any third-party “code generators” or sites that ask for your password or personal details.
