Steal an Egg Biomes: Unlock Order, Best Area & Last Island

Unlock order

#	Biome	Headline pets
1	Forest	Fox $180/s, Brr Brr Patapim $1.8K/s
2	Lake	Turtle, Trulimero Trulicina $260/s
3	Desert	Sand Spider (Mythic) $16K/s
4	Jungle	Gorilla $4.8K/s, Spider (Mythic) $22K/s
5	Snow	Mammoth $42K/s, King Mammoth (Cosmic) $400K/s, Eternal Ice Dragon
6	Volcano	Chillin Chilli $55K/s, Cerberus (Secret) $8M/s
7	Abyss Ocean	Whale Shark $700K/s, Beluga Whale $850K/s, Kraken (Secret)
8	Prehistoric	Bronto (Cosmic) $1.5M/s, Tralaledon (Secret), Eternal Mosasaurus
9	Cosmic	Cosmic-rarity pets, Secret Dragon (Divine Unicorn $1B/s)
10	Cherry Blossom (Update 1)	Crane (unlocks the Sakura Incubator), Divine Kitsune $1.8B/s
11	Titan Temple (Update 2)	Gorilla King (Eternal) $880M/s, Nightflame (Divine) — the current last island

Each biome has its own guardian (snake, Yeti, T-Rex, a sleeping cosmic dragon…) and nests carry a recommended speed label that jumps by roughly an order of magnitude per zone — see the treadmill & speed guide and the full egg list.

Best area to farm at each stage

Just started: Forest until you own a Fox or better, then Desert — the Sand Spider is a Mythic worth $16K/s and the route is short.
Mid-game (speed in the tens of thousands): Snow for King Mammoth ($400K/s) and the chance of an Eternal Ice Dragon alert, then Abyss Ocean — two Cosmic pets (Whale Shark, Beluga Whale) make it the best income zone before Prehistoric.
Late game (≈700K speed): Prehistoric. Bronto at $1.5M/s is a guaranteed-rarity ceiling, and both the Eternal Mosasaurus and Secret Tralaledon alerts fire here.
End game: Cosmic for the Secret Dragon nest and Cosmic-rarity pets; expect the hardest return route in the game (night cycle, dragon).

Rule of thumb from every high-level run: farm the richest biome you can finish every time, not the richest you can reach once.

How biomes unlock

There is no purchase — reaching the biome’s speed band is the unlock. The labels seen on nests were roughly 7K (Volcano nest), 170,000 (Snow Yeti nest), 700,000 (Prehistoric) and 700 million (top Cosmic nest). If the guardian catches you every attempt, that is the game telling you to go back to the treadmill.

The “last island”

Cosmic was the final biome at launch. Update 1 (22 August) added Cherry Blossom (about 2.5B speed, Nine-Tailed Fox guardian, Sakura Incubator) and Update 2 (29 August) added Titan Temple (about 7B speed, Gorilla King guardian) — see the Titan Temple guide and the update log.

Shop eggs are not a biome

Brainrot eggs, Limited eggs and Robux eggs are bought at the base and hatch without a run — limited eggs & shop.

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