Steal An Egg Mutations: Multipliers, Sources and Stacking

Every mutation multiplier used by this site, where each number comes from, which sources disagree, and what has actually been checked in the game.

Mutation multiplier table

Mutation multipliers by source
Mutation	Used here	Fandom	Other sources	Type	Status
Silver	×1.2	x1.2	beebom x1.25; games.gg x1.25; competitor +20%	Variant	Unverified Fandom value, not tested in-game
Golden	×2.5	x2.5	beebom x2; games.gg x2; competitor +150%	Variant	Verified in-game Golden Chicken, 2026-10-09
Rainbow	×3.5	x3.5	beebom x2.5; games.gg x2.5; competitor +250%	Variant	Unverified Fandom value, not tested in-game
Bloom	×1.25	x1.25	beebom x1.5; games.gg x1.5; competitor +25%	Mutation	Unverified Fandom value, not tested in-game
Spirit Bloom	×2.5	x2.5	beebom x3; games.gg x3; competitor +150%	Mutation	Unverified Fandom value, not tested in-game
Parasite	×3	x3	competitor +200%	Mutation	Unverified Fandom value, not tested in-game
Fractured	×2.75	x2.75	competitor +175%	Mutation	Unverified Fandom value, not tested in-game
Scrambled	×2.75	x2.75	—	Mutation	Unverified Fandom value, not tested in-game
Monstrous	Unknown	—	—	Unknown	No number anywhere

"Competitor" is stealaneggcalcuator.com, which writes multipliers as bonuses (+150% = ×2.5). Its numbers match Fandom for every mutation it lists. beebom (2026-08-24) and games.gg (2026-09-08) publish a different set.

Which source we use and why

We use the Fandom wiki numbers. Two Fandom pages, Mutations and Income Calculator, give the same multipliers, and the competitor calculator agrees after converting its percentages. beebom and games.gg give Golden ×2, Silver ×1.25, Rainbow ×2.5, Bloom ×1.5 and Spirit Bloom ×3. Their Golden figure was tested in-game and failed (see below). Because that whole set came from the same two articles, we treat the rest of it as unreliable too, even though Silver, Rainbow, Bloom and Spirit Bloom have not been tested individually.

Only Golden has an in-game test. Every other multiplier is marked Unverified and inherits whatever accuracy the wiki has.

The Golden test: how ×2.5 was confirmed

On 2026-10-09 a fresh account (no rebirth, no gamepass, no boost) had one Golden Chicken in its base. The label above the pet read: Common, Golden Chicken, $9/s, 61Kg.

Base income (Chicken)   $1/s        read directly from the Pet Index
Base weight (Chicken)   8 kg        Fandom calculator data
Weight ratio            61 ÷ 8 = 7.625   (≤ 125, first branch)
Size multiplier         7.625 ^ (37/60) = 3.4998

Fandom  Golden ×2.5:    1 × 3.4998 × 2.5 = 8.75  → shows $9   ✓
beebom  Golden ×2:      1 × 3.4998 × 2   = 7.00  → shows $7   ✗

Weight is shown as a whole number, so the true weight was between 60.5 and 61.5 kg. That range gives 8.71 to 8.79 with ×2.5 and 6.96 to 7.04 with ×2. The conclusion does not change.

The cash balance confirmed it twice. From 21:26 to 21:44 the balance rose from $1,583 to $11,439, about $9,856 in roughly 1,095 seconds, which is $9.00 per second. From 21:56 to 22:08 it rose by $6,711 in about 745 seconds, again $9.00 per second. At ×2 the gain would have been about $7,665 and $5,217. During both windows the base held only this one pet, and the offline claim of $62 was left untouched.

What the test does and does not prove

It confirms Golden ×2.5 together with the size formula and the 8 kg base weight. The three only fit the $9 reading as a set.
It does not pin down the base weight by itself. Any base weight from about 7.0 to 8.4 kg would also show $9 with ×2.5. To get $9 with ×2, the base weight would have to be 4.9 to 5.8 kg, far from the wiki's 8 kg.
It is one pet at one weight. The label also showed a ♂ symbol above the weight whose meaning is unknown, so an unknown multiplier cannot be ruled out completely.
It shows the game paid $9.00 per second, not $8.75. Income looks like it is rounded to whole dollars before it is paid. One sample only.

How mutations stack: not verified yet

Two things are known from the Fandom Income Calculator layout. Silver, Golden and Rainbow sit in a single-choice "Variant" group, so a pet has at most one of them. Bloom, Spirit Bloom, Fractured, Scrambled and Parasite sit in a "Mutations" group where you can pick several. The size multiplier always multiplies with the mutation multiplier.

What is not known is how two or more multipliers combine. The wiki formula just says "× Mutation(s) Multiplier". The competitor calculator says they add as bonuses (Golden + Rainbow = 1 + 1.5 + 2.5 = ×5), but it is the only source to say so and it also allows combinations the wiki says are impossible. Nobody has published a reading of a pet with two mutations.

So every calculator on this site shows both results whenever you pick more than one multiplier:

Multiplied:  Golden ×2.5 and Bloom ×1.25  →  2.5 × 1.25  = ×3.125
Added:       Golden ×2.5 and Bloom ×1.25  →  1 + 1.5 + 0.25 = ×2.75

If you own a pet with two mutations, note its weight and income from the label and compare with both numbers. That single reading would settle it.

How to get each mutation

From the Fandom Mutations and Updates pages. Nothing in this table has been checked in-game.

How each mutation is obtained
Mutation	How to get it
Silver	Random on hatch, roll weight 6 in 100 (Fandom Mutations). beebom and games.gg also mention egg spawns and Admin Abuse events.
Golden	Random on hatch, roll weight 4 in 100 (Fandom Mutations).
Rainbow	Random on hatch, roll weight 1 in 100 (Fandom Mutations).
Bloom	Sakura Incubator / Cherry Blossom event. Fandom only says "likely", and the incubator was not open when we checked. Added in Update 1.
Spirit Bloom	Sakura Incubator. Fandom gives 5% (10% when full); games.gg says 2.5%. The odds conflict and neither is verified.
Parasite	Not from normal hatching. Parasite Egg from the feeding event (Fandom Mutations) and the Hungry Frog event (Fandom Updates).
Fractured	A Mutation consumable used on an egg, 10% chance (Fandom Mutations). The consumable comes from the Rift Boss Shop and Boss Mastery rewards (Fandom Updates).
Scrambled	A Scrambled Mutation consumable from Dr. Scramble’s Shop / Experiment Shop, used on an egg, 10% chance (Fandom).
Monstrous	Limited-time, Monster pets only, small chance from a Monster Chest during the Hungry Frog event (Fandom Updates). No multiplier has been published.

Size is a separate roll

Size (weight) and colour mutation are two independent properties rolled when an egg hatches. A Rainbow pet can be small and a plain pet can be huge. The weight formula and its diminishing-returns branch above 125 × base weight are explained on the calculator page. The wiki also mentions size tiers like Giant ×3 and Huge ×5 in a combination example, which contradicts its own weight formula; we use the weight formula because it matched two independent sets of in-game readings.

What the data labels mean

Verified in-game The pet's rarity and base income were matched against the in-game Pet Index on 2026-10-09. The Pet Index pays a claim reward equal to 100 × the pet's base income per second, so a reward of $100 confirms $1/s. Three pets (Scorpion, Rhinotaur, Glyptodon) show a one-decimal truncated reward in the game, which still agrees with the wiki value. Nineteen pets had their rarity corrected to what the game shows.
Estimated No source lists the base income. We worked it out from the Pet Index reward (reward ÷ 100) by matching the pet's rarity to the only cell with that rarity. Currently only Celestial Sunlion carries this label.
Unverified The numbers come from the Steal An Egg Wiki (Fandom) and have not been matched to the in-game Pet Index. This covers 22 pets that have no Pet Index cell (event dragons, Secret Shrine fusions, experiment pets) and the Enchanted Forest pets whose names are still locked.

Labels follow a strict priority: Estimated first, then Unverified, then Verified in-game. Anything still marked "to be confirmed" in our notes can never be shown as verified.