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Spray guide

Radioactive Spray in Build A Ring Farm

The Radioactive Spray applies the 3x Radioactive mutation — the same one the Nuclear weather event rolls onto crops for free. Four routes are documented in this site's dataset, two more survive only as narration, and every frame here comes from one caption-free recording. Here is what each route costs, what it guarantees, and which numbers nobody has published.

3×
Mutation multiplier
☢️ Radioactive
Mutation
$100B / 159 Robux
Gear Shop price
2 of 4
Copies on the free pass track
Build A Ring Farm hotbar slot 2 holding a Radioactive Spray stack of x30 next to a Tomato Shooter, Rainbow Spray x13, Void Spray x12, Durian Seed x102 and Cosmic Spray x1 outside the Gear Shop
Captured at 7:12 · Slot 2 is the item itself: a 30-stack of Radioactive Spray carried up to the Gear Shop, with a lone Cosmic Spray in slot 6 for scale. A stack size is one player's inventory at one moment, not a shop limit — prices and restock rules live on the Gear Shop and Stock pages.
Observed on camera

Every frame on this page is a real capture from the Freelo Baby recording linked below, checked at full resolution and matched back to the exact second it was pulled — no thumbnails, no recreated panels, no generated art. That recording carries no burned-in captions, no facecam and no channel watermark, which is why it supplies all four images. The second video, from Roblox Guides, burns word-by-word subtitles over all 288 of its seconds and never opens a Radioactive panel, so it is cited for transcript facts only and contributes no frame.

Prices, multipliers, and chances render from this site's game dataset (gears.ts and mutations.ts), re-checked against both recordings on September 18, 2026. The dataset's own source for spray prices is the community wiki's Gear Shop page.

Every way to get a Radioactive Spray

Seven routes are on the record. Four come from this site's dataset, two survive only as narration and publish no number, and one is not a spray at all. The badge on each card says where the information comes from, because these routes are not equally well documented.

  • Gear Shop

    Dataset record

    $100B · 159 Robux

    Gear Shop stock rotates on a timer — check the shelf before planning the purchase

    The only route money settles on its own: the dataset prices this spray at 100B cash or 159 Robux, and the transcript-only recording narrates the same two figures. What nobody promises is availability — the shop rotates its stock on a timer, so whether it is on the shelf right now is a shop question with its own pages.

  • Night Market Season Pass

    Dataset record

    —Not guaranteed

    Cells that pay one copy: Premium 18, Free 23, Premium 27, Free 30. 2 of them sit on the free track.

    Four cells in the 40-tier Night Market Pass pay one spray each, and two of them sit on the free track, so a pass you never bought still delivers copies. The catch is the calendar: this route only exists while that seasonal pass runs, and this site publishes the whole tier table as unverified because its single wiki source has never been checked against gameplay.

  • Composter

    Dataset record

    15%Not guaranteed

    The best documented repeatable farm. The dataset's Prime Compost column lists Radioactive Spray at 15% of rolls and the Overgrown column at 40% — both tables were read off one on-camera odds panel on the 2026-05-26 build, and both total exactly 100%. The frame below shows the plants going in, not the odds coming out.

    Compost Machine loadout screen filled with nine Level 1 Normal plants worth $100T each, six of them Durian, ready to confirm under a Boss Plant HP bar of 17,088 of 18,000
    Captured at 2:00 · Nine slots, every one a Level 1 Normal plant worth $100T, six of them Durian — the input side of the Compost Machine, with the Plant Rush boss bar still counting down above it. The author calls this particular loadout the cheap one at 1:58. The 15% figure comes from a different recording's odds panel, so treat this as loadout evidence rather than odds evidence. · Open the full page

  • Trucker reward pool

    Dataset record

    —Not guaranteed

    The Trucker inspects your farm and grades it, and Radioactive Spray appears in the S+, S and A grade reward pools in the dataset's grade table. It arrives as a roll from a pool rather than a purchase, and no per-item percentage is published for those pools, so none is shown here.

  • Nuclear weather event

    Dataset record

    2%Not guaranteed

    Not a spray at all. While the Nuclear weather event runs, every plant rolls its own chance at the same 3x mutation, which makes the event the cheaper way to get the multiplier whenever the item itself is not the goal. The dataset carries both percentages, and they are printed in the ladder table further down.

  • Contract Rank board

    Community claim

    —Not guaranteed

    Kept on the page because it is the claim the frames recording is actually built on: its author calls the contract board the fastest way to receive sprays and reports pulling two Radioactive Sprays off one repeated quest. The camera never shows a spray in a contract reward row — the card in this page's own frame prints Cash +10%, Super Fertilizer and XP +3000 — so this row publishes no odds and no price.

    Transcendent contract card on the Contract Rank board asking for 2 Radioactive plants plus 50T total seed value, progress 0/2, with Cash +10%, Super Fertilizer and XP +3000 printed as the reward
    Captured at 2:12 · The contract that makes owning the spray worth something: 2 Radioactive plants plus 50T of submitted seed value, paying Cash +10%, Super Fertilizer and XP +3000. Note what is missing from that reward row — a spray. The claim that contracts hand one back is handled in the disputed section below. · Open the full page

  • Plant Rush shop

    Community claim

    —Not guaranteed

    Narration only, and from the transcript-only channel: it prices the spray at 9,000 Plant Tokens in the Plant Rush shop and claims the 18,000 HP boss drops one. The dataset's Plant Rush record lists a Garden Golem and a Cosmic Spray in those reward boxes and never Radioactive, so this row carries no number at all until a panel or the wiki shows otherwise.

Restock timers and what the stall is carrying right now are a shop question, not a spray fact — the stock and restock timer page owns that side of it, and the Gear Shop guide lists every item the stall carries.

What the Compost Machine actually rolls

Two reward columns were read off one on-camera odds panel and both total exactly 100%, so this page publishes them complete instead of quoting a single headline number. The Radioactive row is the one to watch: which tier you have reached changes the answer.

Compost Machine loadout screen filled with nine Level 1 Normal plants worth $100T each, six of them Durian, ready to confirm under a Boss Plant HP bar of 17,088 of 18,000
Captured at 2:00 · Nine slots, every one a Level 1 Normal plant worth $100T, six of them Durian — the input side of the Compost Machine, with the Plant Rush boss bar still counting down above it. The author calls this particular loadout the cheap one at 1:58. The 15% figure comes from a different recording's odds panel, so treat this as loadout evidence rather than odds evidence. · Open the guide

Prime Compost

RewardChance
Radioactive Spray15%
Super Fertilizer x335%
Void Spray27%
Super Pet Treat x323%

Overgrown Compost (next tier)

RewardChance
Rainbow Spray20%
Compost Hydra30%
Radioactive Spray40%
Garden Devourer10%

Both columns render from the dataset's Composter roll tables in transcendent-seeds.ts, recorded on the 2026-05-26 build, and the reward names are the game's own labels. Nothing here argues for feeding the machine 100T plants: the frame above is what the recording's author calls the cheap loadout, and the value going in is what decides which column you are rolling.

Tier costs, machine placement, and everything else the Composter pays belong to the Composter guide; this page keeps to the two columns that name this spray.

Where 3x sits on the mutation ladder

The Index screen is the game's own ranking, and the recording opens it before doing anything else. Every tile is listed below with the multiplier read off camera next to the multiplier this site's dataset publishes — if those two columns ever disagree, this page stops shipping the row.

The Index mutations board in Build A Ring Farm listing Radioactive at 3X between Alien 3.25X and Farm 4X, running from Wet 1.35X up to Fire 10X with one locked ??? tile at 6.5X
Captured at 0:48 · The clearest on-camera answer to how good 3x really is. Every named tile here matches the dataset row for that mutation, which is what the table below shows side by side; the locked tile stays unnamed because the panel never reveals its name. · Open the guide
MutationOn cameraDataset
Wet1.35×1.35×
Autumn2×2×
Frozen1.75×1.75×
Void2.25×2.25×
Alien3.25×3.25×
Radioactive3×3×
Farm4×4×
Starfall4×4×
Admin5×5×
Rainbow5×5×
???6.5×locked
Cosmic8×8×
Bubblegum9×9×
Fire10×10×

Radioactive reads 3x in both columns. The dataset row gives it the Nuclear weather event as its trigger, 2% per plant per roll while that event runs, and 7% for the event itself to start.

Two rungs up, the same evidence problem takes a different shape: the Cosmic Spray guide has to fight for its price across three sources instead of reading one number off a panel.

How to use a Radioactive Spray without wasting it

Five steps, each grounded in the dataset or in a named recording. The rule that matters most is the one both sources agree on: a crop holds one mutation at a time.

  1. 01

    Get a copy

    The Gear Shop for {cash} cash or {robux} Robux when it is stocked, one of the four Night Market Pass cells while that pass runs, or a Compost Machine roll. The pass and the machine are the only routes that hand one out without a price tag.

  2. 02

    Equip it and walk the rows

    A spray is a usable item, not a passive. The frame at the top of this page shows one selected in hotbar slot 2 — the recording demonstrates equipping first, then clicking the crop.

  3. 03

    Read the mutation already on the crop

    A plant carries one mutation and a new spray overwrites the old one. Putting Radioactive on a crop that already holds something better is a downgrade you paid for, so check the tile before you click.

  4. 04

    Clear a mutation you want gone with Acid Spray first

    Acid Spray strips the current mutation without applying a new one, so the 3x lands on a clean plant instead of replacing one you still wanted. Both recordings treat this as the standard pre-spray step.

  5. 05

    Aim at value, not at whatever is ripe

    The multiplier scales one plant's harvest, so it is worth most where value already stacks: a high-rarity, high-level crop on your strongest ring. Both recordings reach the same conclusion from different directions — spraying weak crops is how people waste these.

Acid Spray is cheap next to what it protects: $1M cash or 19 Robux in the Gear Shop. Overwriting a mutation you did not want costs nothing; overwriting one you did want throws away the 3x you were trying to add.

Claims this page refuses to average

Six statements a searcher will run into that the evidence does not settle. Each one stays visible with its source named, because a quietly chosen number is worse than an open argument.

  • The Plant Rush token price

    Disputed

    The transcript-only recording prices the spray at 9,000 Plant Tokens in the Plant Rush shop. No dataset record, wiki line, or panel shows any token price for this item, so the route card carries the row with no number attached.

  • A spray from the boss

    Disputed

    The same channel says the 18,000 HP Plant Rush boss drops a Radioactive Spray. The boss HP ceiling really is on camera in the frames recording; the drop is not, and the dataset's reward boxes list a Garden Golem and a Cosmic Spray only.

  • One harvest as proof

    Disputed

    That recording also narrates a dragon fruit jumping from 3.5M to 10.5M after spraying. It is exactly 3x and therefore consistent with the multiplier — but it is one harvest read aloud, not a published value table, so this page cites it as an illustration and never as data.

  • Stacking with Starfall

    Disputed

    It also claims Radioactive stacked with Starfall just multiplies on top. This site's position is the additive stacking rule documented in mutations.ts — a Fire plant that picks up Starfall sells at 14x, not 40x — and the narration's phrasing is not used anywhere on this page.

  • Contracts as a spray farm

    Disputed

    The frames recording is built on a claim its own panels do not support: the author calls the Contract Rank board the fastest way to receive sprays and reports two Radioactive Sprays off one repeated quest, while the contract card visible in this page's frame prints Cash +10%, Super Fertilizer and XP +3000 as its reward row. Both readings stay on the page, the route stays labelled a community claim, and the author's own warning that this may be an exploit is part of why.

  • Which floor the machine sits on

    Disputed

    The transcript-only channel places the Compost Machine on the second and third floors of your farm. No frame in either recording shows a floor label and no dataset record carries a floor requirement, so this page says machine and not floor.

What this page refuses to publish

Each row is a question a Radioactive Spray owner would reasonably ask and no source can answer. They stay open on purpose; a filled-in guess would be worse than a gap.

  • How often the Gear Shop stocks it

    Unknown

    The narration says the spray has a low chance of appearing when the shop refreshes. No source publishes that probability, so the route card says not guaranteed and stops there.

  • Trucker per-item drop rates

    Unknown

    Radioactive Spray is listed in the S+, S and A grade pools, but the dataset publishes no percentage for any individual item inside those pools and neither recording shows a Trucker reward screen.

  • Whether the pass route is open right now

    Unknown

    The Night Market Pass runs on a calendar, and its 40-tier reward table traces to one wiki revision this site labels unverified. No gameplay footage of the pass appears in either recording.

  • What unlocks each compost column

    Unknown

    The two published columns say what a roll pays, not what you must feed the machine to be rolling that column. The tier cost itself is disputed elsewhere on this site and stays out of this table.

  • A spray from the contract board

    Unknown

    No contract reward table — in the dataset, on the wiki, or on camera — names a spray. The claim exists only as narration in the same recording that supplies this page's frames, so the route carries no odds.

Radioactive Spray questions

How do you get Radioactive Spray in Build A Ring Farm?

Four documented routes: the Gear Shop sells it for 100B cash or 159 Robux when it is in stock, four cells of the Night Market Season Pass pay one copy each with two on the free track, the Compost Machine lists it at 15% of Prime Compost rolls and 40% of Overgrown ones, and the Trucker event includes it in the S+, S and A grade reward pools. Two further claims — a 9,000 Plant Token shop price and a contract-board farming loop — survive only as narration and carry no number on this page.

How much does Radioactive Spray cost?

One published price pair: 100 billion in-game cash or 159 Robux in the Gear Shop. This site's dataset and the transcript-only recording agree on both figures, which is unusual for this item — the 9,000 Plant Token price one channel narrates appears in no dataset record, no wiki line, and no panel.

What does the Radioactive mutation do?

It triples one crop's harvest value. The Index panel on camera reads 3X and the dataset row for the mutation says 3x with the Nuclear weather event as its trigger, so the same multiplier can land on your plants for free whenever that event rolls.

Is the Radioactive Spray worth buying?

As a purchase, rarely. 100B cash buys a 3x that the Nuclear event applies at 2% per plant while it runs, and the ladder on this page shows Alien at 3.25x, Farm at 4x and Rainbow at 5x sitting above it. It earns its price when you need that multiplier on one specific crop right now — a contract asking for Radioactive plants is exactly that case.

What are the Compost Machine odds for Radioactive Spray?

15% in the Prime Compost column and 40% in the Overgrown column, read from one on-camera odds panel recorded on the 2026-05-26 build. Each column totals exactly 100% with its other rewards, so this page publishes both tables complete rather than quoting one number.

Can you farm Radioactive Sprays from contracts?

That is the claim the frames recording is built on — its author calls the Contract Rank board the fastest way to receive sprays, reports two Radioactive Sprays off one repeated quest, and warns that the loop may be an exploit. The contract card in this page's own frame requires 2 Radioactive plants plus 50T of seed value and prints Cash +10%, Super Fertilizer and XP +3000 as its reward row, with no spray in it. Until a reward table names one, this page treats contracts as a reason to own the spray rather than a way to get it.

Check the ladder before you spend 100B

The 3x lands on one crop at a time. Compare every spray's multiplier and price, then run your own ring and level setup through the calculator before buying what the weather hands out.

Compare sprays firstOpen the calculator

Related guides

The mutation this spray applies, the ladder it sits on, the machine that rolls it, and the shops that sell it.

Radioactive mutation record

The dataset row behind the 3x: trigger, per-roll chance, and shop price.

Every spray, ranked

Eclipse down to Wet with multipliers, prices, and sources in one table.

Composter guide

Tiers, inputs, and the full reward columns the 15% and 40% come from.

Gear Shop guide

The full shelf and the restock timer behind the only priced route.

Plant Contracts guide

What the board asks for and pays, including the Radioactive requirement on camera.

Cosmic Spray guide

The 8x two rungs up, and why its price needed three sources to settle.