Koi

Hatching

Egg	Chance
Atlantis Egg	1 in 1 billion

Form	Chance per hatch
Normal	1 in 1 billion
Shiny	1 in 40 billion
Mythic	1 in 100 billion
Shiny Mythic	1 in 4 trillion
XL	1 in 500 billion
Shiny XL	1 in 20 trillion
Mythic XL	1 in 50 trillion
Shiny Mythic XL	1 in 2 quadrillion

Base odds, before any boosts.

Forms

Level 1Level 25

• 

  Normal

  Bubbles

  +6,500

  Gems

  ×120

  Pearls

  ×800

  Copies

  904

• 

  Shiny

  Bubbles

  +9,750

  Gems

  ×180

  Pearls

  ×1,200

  Copies

  70

• 

  Mythic

  Bubbles

  +11,375

  Gems

  ×210

  Pearls

  ×1,400

  Copies

  27

• 

  Shiny Mythic

  Bubbles

  +14,625

  Gems

  ×270

  Pearls

  ×1,800

  Copies

  2

• 

  XL

  Bubbles

  +16,250

  Gems

  ×300

  Pearls

  ×2,000

• 

  Shiny XL

  Bubbles

  +24,375

  Gems

  ×450

  Pearls

  ×3,000

• 

  Mythic XL

  Bubbles

  +28,437.5

  Gems

  ×525

  Pearls

  ×3,500

• 

  Shiny Mythic XL

  Bubbles

  +36,562.5

  Gems

  ×675

  Pearls

  ×4,500

Form	Bubbles	Gems	Pearls	Copies
Normal	+6,500	×120	×800	904
Shiny	+9,750	×180	×1,200	70
Mythic	+11,375	×210	×1,400	27
Shiny Mythic	+14,625	×270	×1,800	2
XL	+16,250	×300	×2,000
Shiny XL	+24,375	×450	×3,000
Mythic XL	+28,437.5	×525	×3,500
Shiny Mythic XL	+36,562.5	×675	×4,500

Trivia

• The Mythic form features Moonburst.
• Reworked from Koi in the original Bubble Gum Simulator.

History

1. 15 Aug 2025Update 16

   Added, hatching from the Atlantis Egg.

2. 29 Aug 2025Update 18

   Removed from the Atlantis Egg. Trading is now the only way to get one.