Steal a Brainrot Summer Fuse Machine Guide — 19 New Brainrots & How to Get Dragon Aquanini

The Fuse Machine is back — and this time, it's bringing summer vibes. The Summer Fuse Machine was added to Steal a Brainrot yesterday (May 22, 2026), introducing 19 brand-new summer-themed Brainrots to collect and fuse .

This guide covers everything you need to know about the Summer Fuse Machine: how to use it, all the new Brainrots you can get, which ones are worth grinding for, and how to protect your precious fusions from being stolen.

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What Is the Summer Fuse Machine?

The Summer Fuse Machine is a limited-time event machine that has been periodically available in Steal a Brainrot. This summer iteration brings a tropical twist — complete with watermelon, coconut, and ocean-themed Brainrots .

Unlike the Cyber Craft Machine (which uses specific recipes), the Fuse Machine works on RNG (random number generation) . You place four Brainrots inside, pay a cash fee, wait for the fusion to complete, and hope for a better Brainrot than you started with .

Key details at a glance:

How to Use the Summer Fuse Machine

Step-by-Step Instructions

⚠️ CRITICAL WARNING: Once the fusion completes, your new Brainrot does NOT automatically teleport to your base. You must carry it back manually — and while carrying it, any player can steal it from you . Place traps on your return path beforehand!

Fusion Time Breakdown

The fusion duration depends on the highest rarity Brainrot you put into the machine :

How the Fuse Machine Determines Your Outcome

The Rarity Averaging System

The machine assigns a numerical value to each rarity tier :

The machine averages these 4 values and rounds to determine your "Dominant Rarity" — the rarity your result will usually be .

The "Step-Up" Chance

You always have a base 10% chance to get a Brainrot one rarity higher than your Dominant Rarity. Using better inputs within that rarity can push this chance up to 50% .

Example: If your Dominant Rarity is Brainrot God, you have a chance to "step up" to a Secret.

Generation & Income Rules

• For same rarity results: Higher-generation inputs make it more likely you'll get the better Brainrot of that rarity.

• For higher rarity results: The machine almost always gives you the lowest-generation Brainrot of that higher tier .

This means that stepping up to a Secret usually gives you the weakest Secret available, not the strongest one.

Trait & Mutation Inheritance

Your fused Brainrot has a 10-20% chance to inherit any traits or mutations from your 4 input Brainrots. If multiple inputs share the same trait or mutation, the chance goes up (max 20% per trait/mutation) .

All 19 Summer Fuse Brainrots

The Summer Fuse Machine introduces 19 brand-new Brainrots . Here's what we know about them so far:

Sources: 

Dragon Aquanini — The Main Reward

Dragon Aquanini is the crown jewel of the Summer Fuse Machine. This aquatic dragon Brainrot is expected to be either Secret or OG rarity, making it one of the rarest Brainrots in the game .

How to Maximize Your Chances at Dragon Aquanini

To even stand a chance at getting Dragon Aquanini, you'll need to put in your best Brainrots . The machine's Step-Up chance is your friend here:

💡 Pro Tip: Don't mix high and low rarity inputs. Putting 3 Secrets and 1 Common will drag down your average and give you a terrible result .

Summer Fuse vs. Other Fuse Machines

The Summer Fuse Machine uses the same core mechanics as previous fuse machines (OG Fuse, Witch Fuse, Santa's Fuse), but with an exclusive summer-themed loot table .

The return of the Fuse Machine is significant — after Santa's Fuse was removed on January 3rd, developer Sammy stated that the fusing mechanic was "gone forever" . This summer revival marks a major comeback for fusing mechanics.

Strategies for Summer Fuse Success

1. Always Fuse Similar Rarity Inputs

Don't mix high and low rarities. If you put 3 Secrets and 1 Common, the machine drags down the average and gives you a terrible result. Always fuse 4 units of similar rarity and generation value .

2. Use a Private Server

If you have access to a private server, use it for fusing. You won't have to worry about other players stealing your Brainrot while you carry it back to base .

3. Place Traps on Your Return Path

The Summer Fuse Machine is located in the middle of the map . After claiming your fused Brainrot, you have to carry it back to your base — and anyone can steal it. Place defensive traps (All-Seeing Sentry, etc.) along your path before you start the fusion process .

4. Fuse Duplicates First

Use the Fuse Machine to consolidate duplicate Brainrots you don't need. This cleans up inventory space while giving you a chance at something better .

5. Boost Your Luck

Use the Server Lucky Boost (249 Robux) for better natural spawns to use as fusion fuel . Playing with friends also increases spawn rates.

6. Check Odds Before Fusing

The fusion UI shows your exact odds before you commit. Always check them — if the percentages are low, consider using different inputs.

Summer Fuse Rarity Values

If you want to calculate your odds manually, use this rarity value scale :

To find your Dominant Rarity:

1. Add up the values of your 4 inputs

2. Divide by 4

3. Round to the nearest whole number

Example: 4 Secrets = 7+7+7+7 = 28 ÷ 4 = 7 (Secret Dominant Rarity)

Frequently Asked Questions

How long will the Summer Fuse Machine be available?

Limited-time event machines typically remain for 2-4 weeks. No official end date has been announced, but previous fuse machines (Santa's Fuse) lasted through the holiday season. The Backrooms Event (Update 50) ended on May 12, and the Anniversary Update (Update 51) was on May 16 .

Can I cancel a fusion?

Yes, you can cancel the fusion process before the timer finishes. Your input Brainrots will be returned to you .

Why is my new Brainrot not in my base?

Unlike canceling a fusion, when the fusion completes, your new Brainrot does NOT teleport to your base. You must carry it back manually. This is a deliberate mechanic — and the risk makes the reward more exciting .

What's the best input combination for Dragon Aquanini?

Use 4 high-tier Secrets or 4 Brainrot Gods. Your best chance at stepping up to OG rarity comes from using the highest possible rarity inputs .

Can I put Lucky Blocks in the Fuse Machine?

Due to a bug, you could previously put Lucky Blocks into the Fuse Machine . It's unclear if this still works in the Summer Fuse version — test at your own risk.

Does the Cyber Craft Machine still work?

Yes, the Cyber Craft Machine remains active alongside the Summer Fuse Machine . You can use both.

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