Steal An Egg Mutations: All Multipliers & How to Get Every One (September 2026)

Mutations are the single biggest income multiplier in Steal An Egg — and the fastest way to turn a middling pet into a money printer. A mutation is a special variant that attaches to an egg or pet and multiplies its money-per-second (money/s) income on top of everything else. Get the right one on a big pet and you can triple its output from a single roll. This is the complete, current mutation guide for the September 2026 version of Steal An Egg (Roblox Games API pull 2026-09-06: 2.45M concurrent players — the #1 experience on the entire platform by a ~3.6× margin over Blox Fruits).

Quick answer: Steal An Egg has five commonly-listed mutations, ranked by the multiplier the community has measured: Silver ≈1.25×, Bloom ≈1.5×, Golden ≈2×, Rainbow ≈2.5×, and Spirit Bloom ≈3× (the strongest). Silver, Golden and Rainbow roll randomly on wild eggs or from the Fuse Machine; Bloom and Spirit Bloom come only from the Sakura Incubator in the Cherry Blossom biome (Spirit Bloom on just ~2.5% of incubator rolls). There is also a rarer Monstrous mutation from the Monster Chest. Multipliers are community-measured, not dev-published — real gains vary slightly by pet weight.

Mutations stack multiplicatively with a pet's rarity, biome and size (weight), so a mutated common can out-earn an unmutated rare. Below is every mutation, its real multiplier, exactly how to get it, and the one honest caveat every other guide skips.

How mutations work in Steal An Egg

Steal An Egg is a steal-and-hatch income sim: you steal eggs from a biome's guardian, hatch them into pets, and every pet generates money/s forever while it sits in your pen. A mutation is a modifier on that income. Three things multiply together to set a pet's real earnings:

• Base income — the money/s baked into that pet, shown in the in-game Pet Index.
• Size (weight) — displayed in kilograms; a Huge or massive roll raises income independently of the mutation.
• Mutation — the flat-ish multiplier covered here.

The mutation is visible on the egg shell before you even pick it up — the shell colour changes (a golden shell, a rainbow shimmer), so you can spot a mutated egg across a biome and prioritise it. That "read it before you steal it" behaviour is what makes patrolling nests worthwhile: the bigger and more colourful the egg, the bigger the payout.

All Steal An Egg mutations and multipliers (September 2026)

Here is every mutation the community currently tracks, with the multiplier most value sites agree on and where each one comes from:

Mutation	Multiplier	Roll source	Notes
Silver	~1.25×	Wild eggs · Fuse Machine	Most common mutation; a small but reliable bump
Bloom	~1.5×	Sakura Incubator	The common Incubator result (~97.5% of rolls)
Golden	~2×	Wild eggs · Fuse Machine	The go-to "good" mutation you can farm
Rainbow	~2.5×	Wild eggs · Fuse Machine	Rare wild roll; strongest mutation you can find outside the Incubator
Spirit Bloom	~3×	Sakura Incubator (~2.5%)	Strongest multiplier in the game; the rarest to land
Monstrous	Not confirmed	Monster Chest (low chance)	Newer, less-documented variant — verify in-game

The one caveat every "5 mutations" article gets wrong: these multipliers are community-measured averages, not developer-published numbers. IGN's official Steal An Egg wiki tested it directly and found the real gain shifts with the pet's weight. In their words:

"We have a Silver TRex that has a 20% monetary increase from the standard TRex money per second amount indicated in the Index. However, our Silver King Snake only has a 17% monetary increase... because of this different amount, we want to avoid placing a definite modifier."

— IGN, All Mutations — Steal An Egg [Roblox] Guide (updated 2026-08-29)

So treat "Silver 1.25×" as a rule of thumb, not a law. The ordering (Silver < Bloom < Golden < Rainbow < Spirit Bloom) is solid; the exact percentage on your specific pet will wobble a few points with its size. Always trust the money/s card on your actual pet over any chart.

The two ways mutations happen

There are exactly two mutation pipelines in Steal An Egg, and they don't overlap.

1. Wild eggs & the Fuse Machine (Silver, Golden, Rainbow)

Silver, Golden and Rainbow appear randomly on eggs that spawn in the biomes. Eggs reset roughly every in-game night (~4.5 minutes), so there is always a fresh batch to check — patrol the nests and grab the recoloured shells first. There is no known way to force which mutation appears on a wild egg; it's pure RNG.

The Fuse Machine (left of the starting area, before the biomes) is the one lever you control. Feed it three or more of the same pet and it has a chance to output that pet with one of the three standard mutations. Higher-earning pets have a better chance to produce a mutation, so fuse your best duplicates, not your Forest chickens.

Warning: if you fuse mutated pets together and not every pet in the fusion carries a mutation, there's a high chance of losing the variant. Fusing three plain copies with one mutated pet will almost always drop the mutation. Only combine mutations deliberately.

2. The Sakura Incubator (Bloom & Spirit Bloom)

Bloom and Spirit Bloom exist only at the Sakura Incubator in the Cherry Blossom biome — the game's end-game zone. Reaching it takes enough Speed to clear the guardian blocking that area, so check your treadmill upgrades before the trip. The Incubator runs on Sakura Crystals you collect during the Great Bloom event, and it applies the mutation to your egg before you hatch it — which means you feed it your best egg, never a throwaway.

The odds are heavily weighted: about 97.5% Bloom (~1.5×) and ~2.5% Spirit Bloom (~3×) — roughly one Spirit Bloom every 40 rolls. The math is worth understanding: an average incubator roll returns about 1.537× base income — `(0.975 × 1.5) + (0.025 × 3)`. In other words, every roll is worth taking, but the expected outcome is basically a plain Bloom. Spirit Bloom is the jackpot tail, not the plan — bank on Bloom and treat a Spirit Bloom as a lucky spike.

Which pets deserve your best mutations

Because a mutation is a multiplier, its value scales with the base pet you put it on. Putting a 3× Spirit Bloom on a $1/s Forest chicken nets you $3/s — pointless. Put the same mutation on a top-tier earner and it prints. The playbook:

• Save Rainbow and Spirit Bloom for your highest money/s pets. The higher the base income, the more raw cash the multiplier adds. A 2.5× on a Legendary or better is where income actually spikes.
• Stack mutation × size. A Rainbow or Spirit Bloom on a large-weight pet applies two separate boosts at once — this is the real end-game income ceiling.
• Don't waste Golden farm-fusions on low tiers. Fuse duplicates of strong pets so any mutation you roll lands on something worth keeping.
• Attend Admin Abuse events. They can hand out already-mutated eggs (Golden or Rainbow) without the usual hatch RNG — not a daily method, but free value when one runs on your server.

For the full income ranking of which pets are worth mutating in the first place, see our Steal An Egg value list and the biome-by-biome best pets guide. If you're chasing Bloom mutations specifically, the Cherry Blossom update guide covers unlocking the Sakura zone.

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FAQ

What is the best mutation in Steal An Egg? Spirit Bloom is the strongest at roughly a 3× income multiplier. It only comes from the Sakura Incubator in the Cherry Blossom biome and lands on about 2.5% of rolls (~1 in 40), so it's also the hardest to get. If you can't reach the Incubator yet, Rainbow (~2.5×) is the best mutation you can find on wild eggs.

How many mutations are there in Steal An Egg? Five are commonly listed and tracked by value sites — Silver, Bloom, Golden, Rainbow and Spirit Bloom — plus a rarer, less-documented Monstrous mutation from the Monster Chest. Roblox's developers don't publish an official mutation list, so always verify against the in-game shell colours and your Pet Index.

How do I get the Golden mutation? Golden (~2×) rolls randomly on wild eggs across the biomes, or from the Fuse Machine when you combine three or more of the same pet. You can't force it — patrol nests for golden-shelled eggs and fuse duplicates of your strongest pets to raise your odds.

Are the mutation multipliers exact? No. The community numbers (1.25×, 1.5×, 2×, 2.5×, 3×) are measured averages, not developer-confirmed values. IGN's testing shows the actual percentage gain shifts with a pet's weight — a Silver T-Rex gained ~20% while a Silver King Snake gained ~17%. Trust the money/s figure on your own pet over any chart.

Can I lose a mutation? Yes. If you use the Fuse Machine and not every pet in the fusion carries a mutation, there's a high chance the variant is dropped. Only fuse mutated pets together on purpose — never mix a mutated pet with plain copies unless you're willing to lose the mutation.

Do mutations stack with size? Yes. Size (weight) is a separate attribute from mutation, and both multiply the base income independently. A Rainbow or Spirit Bloom on a Huge/large-weight pet is the highest-income combination in the game.