In Steal An Egg, the Fuse Machine consumes three pets of one species and returns one egg for that species. The hatchling may be larger, more valuable, and mutated, but it may also be smaller and weaker than every sacrifice. Paying for fusion only buys a reroll; improvement is not assured.
Quick answer: At the safe-zone Fuse Machine, put three pets of one species into the three slots, pay the fee shown on the button, and hatch the returned egg. Since the outcome is random, use only duplicate pets you can spare.
What the Fuse Machine does and its one hard rule
The machine reads “Bring 3 same Pets to Fuse,” and it means exactly that. You need three copies of the same species, not three pets that happen to share a rarity. Three T-Rexes work. Three Krakens work. A Walrus, an Axolotl, and a Golden Bear do not, even if all three are the same rarity.
The species must match, but the pets can have different weights or mutations. The face display shows the slot count: 0/3 means nothing is loaded, while 2/3 indicates one copy remains. The menu also labels the open slot “1 Pet Left.” With no cooldown, the machine is usable whenever you have the required pets and cash.
One thing the machine will not do is preserve value. Weights do not add together, and there is no floor guaranteeing the result matches your lightest input. One captured test fused three Scorpions weighing 457 kg, 256 kg, and 247 kg, including a Silver variant, for a $114 million fee, and the egg hatched into an 86 kg Scorpion. That is lighter than all three pets that went in.
How to fuse three pets
A failed fuse can be traced to one of three issues: an unfilled slot, pets from different species, or insufficient cash for the fee. The cash requirement is especially easy to overlook for costly fusions in late zones.
Fusion costs by pet tier
The machine calculates its fee from the pets supplied. Three high-tier duplicates can cost vastly more than three animals from an early area. The listed prices are actual fusion fees and show how sharply costs rise with later zones and heavier pets.
| Pets fused (three of each) | Cash cost |
|---|---|
| Walrus | $310K |
| Cosmic Gecko | $23M |
| Legendary Shark | $80M |
| Orca | $284M |
| Spideron | $873M |
| Mutant Shark | $112B |
| Stag | $278B |
| Gorilla King | $1T |
| Oni Tiger | $2.5T |
Game updates can alter prices, so use the amount displayed on the fuse button in your own server as the authoritative figure.
Mutations do not carry over
Fusion exists mainly for its mutation chance. The resulting pet may be mutated, causing its income multiplier to exceed what the sacrificed pets could provide. That potential is the system’s main payoff.
Mutation status is not passed to the result. A mutated input can produce an ordinary result, while still being consumed by the machine. Leave Luminous, Rainbow, and every other mutated pet out of the slots; otherwise, you trade a guaranteed income boost for only a chance to get another.
The interface suggests the odds through the message “Better pets give more Luck!” Stronger inputs raise the likelihood of a stronger result, making three late-zone duplicates a better gamble than three starter animals. The attempt also carries a much higher price.
Best pets to feed the Fuse Machine
For the best use of the machine, choose Secret, Eternal, and Divine pets from any biome. Mythic, Cosmic, and lower rarities make the grind heavier while offering a weaker payoff. When these rarities appear on the map, farm them and retain extra sets for fusion.
These are the critters worth stockpiling for fusion:
- Yeti, Ice Dragon, Cerberus, Phoenix
- Lava Dragon, Kraken, El Maja, Tralaledon
- TRex, Mosasaurus, Cosmic Skeleton Boss, Eternal Lunar Dragon
- Unicorn, Stag, Oni Tiger, Kitsune
- Mutant Shark, Gorilla King, Nightflame, Centaur
- Pure Jellyfish, Pegasus, ArchAngel, Gargoyle
- RazorFang, Skeleton Horse, World Burner
Tested recipes that produced huge eggs
Those three-of-a-kind heavy-pet recipes produced massive eggs. Since luck controls the outcome, attempt them only when your backpack contains several spare sets.
| Recipe (3 of each) | Result | Notes |
|---|---|---|
| Pure Jellyfish (~11,000 kg each) | Pure Jellyfish Egg | 635,856 kg egg, 7h 49m grow |
| Mosasaurus (up to 218,600 kg) | Mosasaurus Egg | Huge egg |
| Oni Tiger (~200–270 kg) | Cherry Blossom Egg | Big egg |
| Gorilla King (~71,000+ kg) | Gorilla King Egg | Huge egg |
| Mutant Shark (up to 188,844 kg) | Titan Temple Egg | 2h 59m grow |
Higher input weight gives a chance to multiply base stats into enormous eggs. One T-Rex fusion produced a 1,547,907 kg Prehistoric Egg worth $1.4B/s, and top players stack repeated fusions to build multi-million-kilogram Gargoyles, Oni Tigers, and Gorilla Kings that earn tens of billions per second.
Secret Fusion Shrine pairings
Separate from the normal machine, the Secret Angels & Demons Shrine is a two-sided system. Instead of three matching pets, it takes one eligible Light pet and one eligible Dark pet from the Angels and Demons biome. Place the Light pet on the yellow pedestal and the Dark pet on the red pedestal to create a special Fusion Egg, which you can then run through the Fuse Machine for a bigger version.
| Light input | Dark input | Result | Rarity / Base $ |
|---|---|---|---|
| Pegasus (Eternal) | Skeleton Horse (Eternal) | Equinox | Eternal · $1.8B/s |
| ArchAngel (Divine) | World Burner (Divine) | Aetheron | Divine · $6.9B/s |
The light-and-dark Equinox fuse is available once per account, so save your heaviest Light and Dark pets rather than spending smaller ones. Confirm that Angels and Demons content is active on your server before you enter the Shrine, since the zone’s availability and requirements can change.
When fusing is worth it, and when to hold back
Fusion removes three pets and supplies one replacement. If the inputs were your three best earners, your income falls as soon as you activate the machine, and the new pet must outperform their combined earnings merely to break even—a rare result. Review every pet’s money-per-second figure at your base before sacrificing it.
A good rule is to use only weak or extra duplicates. Pets left out of your active lineup generate no income, so sacrificing one for a single roll costs nothing you were earning. Keep your best specimen of each species away from the machine, and view fusion as duplicate cleanup with a lottery chance attached. The outcome is usually disappointing, but this is still the most effective way to remove spare pets while pursuing the rare massive egg.
