Sinister Skull · Bubble Gum Simulator Infinity Wiki

Sinister Skull is a limited Secret pet in Bubble Gum Simulator Infinity. It could be hatched from the

Sinister Egg at a 1 in 10 billion chance while it was out, from 17 October to 7 November 2025. It was part of Halloween 2025.

Hatching

Egg	Chance
Sinister Egg	1 in 10 billion

Base odds, before any boosts.

Form	Bubbles	Gems	Coins	Copies
Normal	+7,350	×135	×4,250	1,954
Shiny	+11,025	×202.5	×6,375	423
Mythic	+12,862.5	×236.25	×7,437.5	66
Shiny Mythic	+16,537.5	×303.75	×9,562.5	15
XL	+18,375	×337.5	×10,625
Shiny XL	+27,562.5	×506.25	×15,937.5
Mythic XL	+32,156.25	×590.63	×18,593.75
Shiny Mythic XL	+41,343.75	×759.38	×23,906.25

17 Oct 2025Update 25
Added, hatching from the Sinister Egg.
7 Nov 2025Update 28
Removed from the Sinister Egg when the Halloween 2025 event ended. Trading is now the only way to get one.

Secret petsShow

CategoriesPets

Sources: Bubble Gum Simulator Infinity, read from the game, Bgs-infinity Fandom wiki (CC BY-SA)

Last edited 15 Oct 2026