Steal An Egg / Mutations
Steal An Egg mutations and multipliers
Color mutations multiply a pet's income. Size is a separate roll that multiplies again.
Updated 9 November 2026
Short answer: In Steal An Egg, Rainbow is the best hatch mutation at x3.5 income, but its roll weight is only 1 in 100. Golden gives x2.5 (weight 4) and Silver x1.2 (weight 6). Parasite x3, Fractured x2.75 and Scrambled x2.75 come from special eggs or items. Size is a separate roll that multiplies income again.
Last checked:
Rainbow x3.5 is the top hatch mutation, Golden x2.5 is the common good roll, Silver x1.2 the small one. Multiply by size for the real income.
| Mutation | Income multiplier | How to get it | Source |
|---|---|---|---|
 Rainbow | x3.5 | Very rare hatch roll (weight 1 of 100). Animated rainbow colours. | Steal An Egg Wiki |
 Parasite | x3.0 | Not from normal hatching. Comes from its own Parasite Egg in the feeding event. | Steal An Egg Wiki |
 Fractured | x2.75 | Applied to an egg with a Mutation Consumable, 10% chance. | Steal An Egg Wiki |
 Scrambled | x2.75 | From Dr. Scramble's Shop, applied to an egg with a 10% chance. | Steal An Egg Wiki |
 Golden | x2.5 | Hatch roll (weight 4 of 100). Shiny gold with coin particles. | Steal An Egg Wiki |
 Spirit Bloom | x2.5 | Not from normal hatching. Came from the Sakura Incubator in the Cherry Blossom event (not active now). | Steal An Egg Wiki |
 Bloom | x1.25 | Cherry blossom petals. Tied to the Sakura event. | Steal An Egg Wiki |
 Silver | x1.2 | Hatch roll (weight 6 of 100). Metallic silver. | Steal An Egg Wiki |
| Abducted | x2.5 | Added with the UFO event (Update 11), now from fishing in the Aliens biome. eggPing lists x2.5 (8 Nov 2026); the Fandom wiki has no entry yet. | eggPing |
| Dark Matter | x2.5 | Update 12 fishing reward or 1,750 Void Pearls at the Alien Trade-In, with a 30% chance to work on a placed egg. The fan wiki stealanegg-roblox.wiki lists x2.5 (8 Nov 2026); the Fandom wiki has no entry yet. | stealanegg-roblox.wiki |
Abducted and Dark Matter are desk rows, not official Alien Biome patch notes. The Alien Biome guide keeps that line clear and does not repeat unofficial multipliers.
How size stacks
Final income = base income × mutation multiplier × size multiplier.
Size is a separate roll shown as weight in kg. Up to 125 times the hidden base weight, income grows with (weight ratio)^(37/60). Above that the game applies diminishing returns. The wiki gives these examples: about 17 times base income at 100 times base weight, about 23 times at 200 times and about 45 times at 1000 times.
Try it in the income calculator
Source: Steal An Egg Wiki: Mutations (revision 20 Sep 2026) (CC BY-SA). Mutation icons from the same wiki, resized and hosted here. Abducted from eggPing, Dark Matter from stealanegg-roblox.wiki, both 8 November 2026. Credits
FAQ
What is the best mutation in Steal An Egg?
Rainbow, at x3.5 income on the wiki table. It is also the rarest normal hatch roll.
Do mutations stack with size?
Yes. Final income is base income times the mutation multiplier times the size multiplier.
How often is Golden?
The wiki lists a roll weight of 4 out of 100 for Golden, 6 for Silver and 1 for Rainbow.
How do you get the Parasite mutation?
Not from normal hatching. The Steal An Egg Wiki says it comes from its own Parasite Egg in the feeding event, and it multiplies income by x3.
How do Fractured and Scrambled work?
Both give x2.75. Fractured is applied to an egg with a Mutation Consumable and Scrambled comes from Dr. Scramble's Shop. Each has a 10% chance to work.
How much income does size add?
Up to 125 times the base weight, income grows with the weight ratio to the power of 37/60. The wiki gives about 17 times base income at 100 times base weight and about 45 times at 1000 times.