Steal An Egg mutations and their multipliers

The three ways mutations happen

Found on the map, or fused

Silver, Golden and Rainbow appear on already-mutated eggs out in the biomes, or can come out of the Fuse Machine. Finding them on the map is pure RNG — there is no known way to influence which mutation appears on a wild egg.

The Fuse Machine, in brief

It takes three of the same species, destroys them, and gives back one egg of that species, with better inputs raising the luck of the result — including a mutated one. No odds are published, and a mutation already on an input is reported not to carry over, so never feed it a mutated pet you are earning from. The full walkthrough, and the separate Secret Shrine fusion added on 12 September, are in thefusion guide.

Bought and applied

With this route you choose which mutation to attempt, but success is not guaranteed. Two consumables now exist: Fractured, bought with Boss Tokens in the shop inside a rift, and Scrambled, bought for Samples, in Dr. Scramble’s Experiments shop; check the current shop price. These consumables are applied to unhatched eggs. The old claim that the shop closed on 26 September was too broad: a29 September walkthroughstill describes Scrambled purchases. Check the current shop for price and availability.

What nobody publishes is how much either one is worth. The multiplier is absent from every source we can find, which is why they sit in their own table above with the cell reading not published rather than an estimate. Scrambled at least states its odds of taking: the shop card reads 10%, and two more sources agree — though one otherwise reliable guide says 1% instead, so treat a failed application as normal either way. A recording that tries to stack Scrambled onto an already-Fractured egg fails on camera, so whether the two can coexist is still open.

Skeletal versions in the Extinction Egg

The 26 September update added an Extinction Egg in the paid Featured shop. Bloxodes and GameBoostdescribe Skeletal versions of its pets. That does not establish a consumable you can apply to any egg, nor a uniform income multiplier. We therefore keep Skeletal out of the general multiplier table and calculator. Scrambled versions of Lab eggs also appear on the new Boss Mastery track; those do not imply a new multiplier.

The Sakura Incubator

Bloom and Spirit Bloom exist only here, in the Cherry Blossom biome, and the machine runs on Sakura Crystals collected during the Great Bloom event. The important thing about these two is that their odds move, which is not true of any other mutation in the game.

Left alone, an uncharged egg rolls Spirit Bloom on 2.5% of attempts — roughly one in 40 — and Bloom the rest of the time. Charging the egg in the incubator raises the Spirit Bloom share, and buying the three Luck Boosts raises it again, to a reported 40% at full 150% charge. That is a sixteen-fold swing in the thing everyone is actually farming for.

What those odds actually mean

An uncharged roll returns, on average, 1.537× the base income — (97.5% × 1.5) + (2.5% × 3). Spirit Bloom is the tail, not the expectation. A fully charged and fully boosted roll returns 2.10× instead, because the tail has become 40% of the outcomes.

That gap is the whole decision. At the floor, crystals belong on your highest-base-income eggs and nothing else, because you are buying an average of 1.54× and the multiplier is proportional — a 1.5× on a Divine pet beats a 3× on anything from an early biome. Charged and boosted, you are buying 2.10× instead, which is worth roughly 1.4× more per crystal. Put both cases into the income calculator against a pet you actually own before spending anything.

Mutations FAQ

What is the best mutation in Steal An Egg?

Spirit Bloom, at 3× income. It comes from the Sakura Incubator, and its roll chance is a range rather than a number: 2.5% – 40%, depending on how far the egg is charged and whether the paid Luck Boosts are bought.

How many mutations are documented here?

7 mutation types are documented here. 5 have published multipliers: Silver (1.25×), Bloom (1.5×), Golden (2×), Rainbow (2.5×), Spirit Bloom (3×). Fractured and Scrambled are also available as consumables, with no verified multiplier. The September Extinction Egg has Skeletal variants; we do not count those as a general mutation without evidence that they can be applied to other eggs.

How do you get mutations?

Three routes. Silver, Golden and Rainbow are found on the map or produced by the Fuse Machine. Bloom and Spirit Bloom come only from the Sakura Incubator in the Cherry Blossom biome. Fractured and Scrambled are neither found nor rolled: you buy a consumable with event currency and apply it to an egg you are already holding.

What does the Fuse Machine do?

It takes three pets of the same species — not three of the same rarity — destroys them, and gives back one egg of that species, which then has to hatch. The machine says better pets give more luck, so stronger inputs raise the chance of a stronger or mutated result, but no odds are published. Because three pets become one, it is for surplus duplicates, not your best earners.

Do mutations stack with size?

Yes. A large pet with a mutation earns more than either bonus alone, which is why two pets of the same species can be worth very different amounts.

Can you get a mutation on a pet you already own?

No. Every mutation in the game attaches to an egg, not to a hatched pet, which means the decision of which egg to spend crystals or a consumable on has to be made before you know what is inside. The Fractured and Scrambled consumables are sometimes described as working on pets you own; recordings show them being applied to unhatched eggs.