Koi in Steal An Egg

Cosmic · wiki data synced Oct 24, 2026

Koi is a Cosmic pet that earns $12M/s at its base size of 120 kg. It hatches from eggs stolen in Cherry Blossom, where about 1 in 23 eggs is a Koi egg (4.36%).

It is #115 of 236 pets by base income, and #4 of 8 in Cherry Blossom.

Rarity: Cosmic
Base income: $12M/s
Base size: 120 kg
Zone: Cherry Blossom
Speed needed: 2.5B
Egg: Koi Egg
Drop chance: 4.36%
Grow time: 25m
Reward: +4.2m Speed, $1.2b

How to get Koi

Train until you have at least 2.5B Speed, then go to Cherry Blossom, zone 10 of 14, guarded by the Oni Tiger. Steal eggs there and bring them back to your base to hatch.

Each egg that spawns in Cherry Blossom has a 4.36% chance to be a Koi Egg. That means you need to see about 16 eggs for a 50% chance of at least one, and 52 eggs for 90%.

A Koi egg takes 25m to hatch, and the wiki lists its reward as +4.2m Speed, $1.2b.

Koi value by size and mutation

Income grows with weight but slows down past 125× the base size. These are the wiki's formula at three sizes:

Size	Normal	Golden ×2.5	Rainbow ×3.5
120 kg (base)	$12M/s	$30M/s	$42M/s
1,200 kg	$49.6M/s	$124M/s	$174M/s
12,000 kg	$205M/s	$513M/s	$719M/s

Work out your own Koi: open it in the income calculator. All multipliers are on the mutations page.

How Koi compares

By base income Koi is #115 of 236 overall and #14 of 36 Cosmic pets. Just above it: Citadel Snail #007 ($12.5M/s); just below: Stacked Turtle ($12M/s).

Other pets in Cherry Blossom

Pet	Rarity	Base $/s	Drop chance
Crane	Epic	$4K/s	37.5%
Salamander	Legendary	$74K/s	26.3%
Red Panda	Mythic	$450K/s	16.8%
Snowy Owl	Cosmic	$7.5M/s	14%
Koi	Cosmic	$12M/s	4.36%
Stag	Secret	$145M/s	0.74% (1 in 135)
Oni Tiger	Eternal	$600M/s	0.31% (1 in 323)
Kitsune	Divine	$1.8B/s	0.02% (1 in 5,000)

Source: Koi on the Steal An Egg Wiki (CC BY-SA). First listed on the wiki Sep 3, 2026, during the Monsters Are Coming week. Synced Oct 24, 2026.