Every egg in Steal an Egg carries a weight in kilograms, and that number follows the egg all the way through incubation. A 2,020 kg Eternal Phoenix Egg hatches a small Phoenix. A 13.2M kg Cosmic Skeleton Boss Egg hatches a pet that towers over the base and prints billions per second. Egg size is not random luck at hatch time — it is decided the moment the egg spawns in the world, which is exactly why the biggest-egg hunt is really a hunt for the right server.
Quick answer: Run to the highest biome your Speed allows, compare the egg sizes at the nest, and if nothing there is huge, leave and rejoin a different non-full server. Egg spawns and their weights reroll per server, so repeat until a multi-million-kilogram egg appears, then carry it home before the reset timer ends.
How egg size decides pet size and income
Two things set what a pet earns: the species you hatch, and how heavy the egg was. Species comes from the biome and rarity tier, running Common through Uncommon, Rare, Epic, Legendary, Mythic, Cosmic, Secret, Eternal, and Divine. Weight then scales that pet up or down. A basic Cosmic Dragon hatched from a small egg sits around $112M/s, while a 2,926,735 kg Cosmic Secret Egg produced a Cosmic Dragon making $3.5B/s.
Size does not override rarity, though. An 8M kg Bronto hatched at $37.3M/s, less than a much smaller Secret T-Rex at $179M/s. The best result is a heavy egg of a high-rarity species, which is why players chase giant Secret, Eternal, and Divine spawns in Prehistoric, Volcano, Abyss Ocean, and Cosmic rather than hauling a huge Forest egg.
| Egg | Weight | Pet income |
|---|---|---|
| Cosmic Skeleton Boss (Spirit Bloom) | 13.2M kg | $14.2B/s |
| Cosmic Secret Egg | 2.9M kg | $3.5B/s |
| Volcano Egg (Cerberus) | 1.78M kg | $188.9M/s |
| Titan Temple Egg (Gorilla King) | 776,474 kg | $3.1B/s |
| Prehistoric Egg (Bronto) | 8.3M kg | $37.3M/s |
| Prehistoric Egg (Brontosaurus) | 55,153,977 kg | $162M/s |
Server hopping method: How to reroll egg sizes
Eggs reset across all zones roughly every in-game night, about every four and a half minutes, and each server rolls its own spawns. If the current server only has small eggs at the nests, waiting out the cycle is slower than switching servers. Unhatched eggs waiting in your inventory also reroll when you rejoin, which is the whole trick behind stacking huge eggs before planting them.
Note: server notifications call out high-tier spawns by name, such as a Secret Cosmic Skeleton Boss Egg in Cosmic or an Eternal Oni Tiger Egg in Cherry Blossom. Those alerts are the cue to stop hopping and start running.
Speed requirements for carrying heavy eggs
Speed is the gate on egg weight. You train it on the treadmill and raise it further with Speed Multipliers in the shop, up through tiers that reach thousands of times your base rate, plus the Angelic Treadmill for the highest values. Players hunting million-kilogram eggs in Cosmic and Prehistoric are commonly running with tens of billions of Speed, because a heavy egg turns a short sprint into a long crawl.
The shop also sells the x2 Growth and x2 Money passes, which change how fast eggs mature and how much your equipped pets pay out. Neither affects egg size, so treat them as income tools rather than part of the big-egg hunt.
Mutations at the Sakura Incubator
Before planting a heavy egg, take it to the altar in the Cherry Blossom zone. Depositing Sakura Crystals fills the charge meter, and Luck Boosts bought with Robux push the Spirit Bloom chance up to around 40 percent from a base rate near 5 percent. Rolling at the default rate almost always lands on the ordinary Bloom mutation instead.
The payoff is large on an already-huge egg. A 13.2M kg Cosmic Skeleton Boss Egg mutated to Spirit Bloom hatched a pet worth $14.2B/s, which climbed to $28.5B/s once the rest of the lineup was equipped. Mutation is always an upgrade over the plain version, so keep the mutated copy and sell the duplicate.
Hatching and confirming the result
Giant eggs carry the longest timers, so the Growing Eggs menu offers Instant Grow All for Robux. The price scales with how many eggs are waiting, and it has landed anywhere from 64 to 180 Robux on a full plot. Filling every pen first and buying once is far cheaper than skipping timers one egg at a time.
You know the size carried over when the hatched pet displays the same kilogram figure the egg had, alongside its money-per-second rate. A 13.2M kg egg produces a 13.2M kg pet. Open the Pet Index to confirm the species unlocked, then use Equip Best to make sure the new pet is actually generating income, since unequipped pets pay nothing and can drop your base to $0/s.
The Fuse Machine is the other route to a giant pet. It merges three smaller pets into one larger one, which is worth doing with duplicates you would otherwise sell at the stall.
Why the biggest egg gets away
Most failed steals come down to a handful of repeatable problems rather than bad luck.
- Not enough Speed. The guardian pet, such as the T-Rex in Prehistoric or the Cosmic Skeleton Boss, knocks you down before you clear its nest.
- Getting bat-hit by another player. A hit while carrying makes you drop the egg, and whoever is closest picks it up.
- Running out of reset time. Eggs vanish at the next cycle, so a slow haul from an end-zone biome can end just short of the safe zone.
- No free pens. A full plot leaves nowhere to place the egg, so clear or sell weak pets before the run.
- Joining crowded servers. Popular servers have the nests stripped within seconds of a reset.
The consistent pattern behind every record-sized pet is the same short loop. Push Speed high enough to survive the late biomes, hop servers until the nests roll something enormous, mutate it at the altar if it is worth the crystals, then plant and hatch everything in one batch.
