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Mutations & Sizes

Mutations roll when an egg hatches and multiply a pet's earnings. One color mutation and one size can stack multiplicatively. Use the income calculator to apply them to any pet.

Color mutations

Roll on hatch; multiply cash per second.

Rainbow

×5

Rainbow aura. The highest documented income multiplier (×5) and the rarest roll — the main endgame target.

Last checked 1 day ago

Golden

×2

Golden appearance with particle effect. Doubles the pet's cash per second. The most common mutation roll.

Last checked 1 day ago

Sizes

Separate roll; Giant also multiplies Speed.

Giant

×3

Significantly larger model. Triples both cash and speed stats — a hybrid income + escape tool. Stacks multiplicatively with Golden (×6) or Rainbow (×15).

Tiny

×1

Smaller model. No income multiplier; community sources report faster hatch utility. Niche value for incubator sessions.

Stacking table

Every combination, one copy of a pet.

CombinationTotal income multiplier
Plain pet×1
Golden×2
Giant×3
Rainbow×5
Golden + Giant×6
Rainbow + Giant×15

About the odds

Why no percentages are shown.

Mutation roll rates are not officially published. Multipliers above are community-reported from gameplay and consistent across sources; chances are marked unknown until verified. Luck boosts (like the community-reported Lucky Hatch purchase) are said to improve rolls, but their exact effect is undocumented.

FAQ

How do mutations work in Steal An Egg?

When an egg hatches, the pet can roll a color mutation (Golden ×2 or Rainbow ×5 income) and, separately, a size (Giant ×3 or Tiny). One of each can stack, so the best combo is Rainbow + Giant at 15× base income.

What are the chances of hatching a Golden or Rainbow pet?

Not published. Community consensus is that Golden is the most common roll, Rainbow the rarest, and Giant/Tiny uncommon in between. Any exact percentage you see online is an estimate.

Does Giant make the pet better than Rainbow?

They stack, so it's not either/or. Alone, Rainbow (×5) beats Giant (×3); together they multiply to ×15. Giant also adds Speed, which helps when carrying eggs out of deep biomes.

Do mutations help me progress to new biomes?

Indirectly — higher income funds treadmill and base upgrades faster. Giant's Speed boost also directly helps outrunning guardians while carrying stolen eggs.