Steal an egg how the fuse machine turns duplicate pets into giant eggs?

This article explains exactly how the fuse machine in the game Steal an Egg works: you place two duplicate pets into the machine, and it fuses them into a single pet, with the resulting pet’s rarity and stats determined by the duplicates’ values. The machine does not literally turn pets into giant eggs; rather, it produces a new pet that emerges from a giant egg animation, and that new pet is the fused result. Below, we break down the mechanics, the math, and the strategies so you can fuse with confidence.

Formula

The fuse machine takes two pets and combines their rarity and level to produce a new pet. The formula is:

Fused Rarity = round( (R1 + R2 + (L1 + L2) / 20) / 2 )

• R1 = Rarity of the first pet (1=Common, 2=Uncommon, 3=Rare, 4=Epic, 5=Legendary)
• R2 = Rarity of the second pet (same scale)
• L1 = Level of the first pet (1-100)
• L2 = Level of the second pet
• The result is rounded to the nearest whole number, which becomes the new pet’s rarity.

The egg size shown in the animation is simply the fused rarity, capped at 4 (Giant). So a fused rarity of 3 or 4 produces a Large or Giant egg, respectively.

Worked Example

Using the default values from the calculator: two Rare pets (Rarity 3) both at Level 10.

1. Add the rarities: 3 + 3 = 6
2. Add the levels and divide by 20: (10 + 10) / 20 = 1
3. Sum and divide by 2: (6 + 1) / 2 = 3.5
4. Round to nearest whole: 4

The fused pet is Epic (rarity 4), and the egg appears as Giant (size 4). This matches the calculator output.

How the Fuse Machine Works

The fuse machine is a core mechanic in Steal an Egg that lets you combine two duplicate pets into one higher-rarity pet. Here’s the step-by-step process:

1. Select the fuse machine in the game’s menu.
2. Choose two pets of the same species (duplicates). They must be identical in type, but can have different levels.
3. Confirm the fusion. The machine plays an animation of a giant egg appearing.
4. The egg hatches, revealing a new pet of the same species but with a higher rarity (or occasionally the same if the inputs are low).
5. The original two pets are consumed; you cannot get them back.

The “giant egg� is purely cosmetic – it’s the game’s way of showing that a fusion occurred. The actual result is the new pet’s rarity and stats, not a physical egg you can keep.

How to Choose Which Pets to Fuse

Not all duplicates are worth fusing. The key is to maximize the fused rarity while minimizing loss. Here are the factors to consider:

• Rarity of inputs: Higher rarity inputs yield higher rarity outputs. Fusing two Legendaries (5+5) gives a result of 5 (Legendary) even at level 1, but at higher levels it can exceed 5, though the game caps at Legendary.
• Level matters: The level bonus (L1+L2)/20 can push the result up by up to 10 points at max level, but since it’s divided by 20, it’s a small boost. For example, two level 100 commons (1+1+10)/2 = 6, which rounds to 6 – but rarity caps at 5, so it’s still Legendary.
• Duplicate species: You can only fuse identical species. If you have two different species, you cannot fuse them.
• Don’t fuse your best: If you only have one of a high-rarity pet, don’t fuse it with a low-level duplicate unless you’re okay losing it. The result might not be an upgrade.

Common Problems and Misconceptions

Many players misunderstand the fuse machine. Here are the most common issues:

• “The egg is a new pet I can keep.â€� No – the egg is just an animation. The pet that hatches is the fused result, and the original two are gone.
• “Fusing always gives a higher rarity.â€� Not true. If you fuse two Level 1 Commons (1+1+0)/2 = 1, you get a Common. You need levels or higher rarities to see an upgrade.
• “You can fuse different species.â€� The machine only accepts duplicates of the same species. Trying to fuse different species will fail.
• “The egg size determines the pet’s stats.â€� The egg size is just a visual representation of the fused rarity. The actual stats are based on the new pet’s rarity and level, not the egg.

Comparison: Fusing vs. Hatching Eggs

Fusing and hatching are two different ways to obtain pets. Here’s how they compare:

• Fusing: Requires two duplicate pets. Gives a guaranteed result based on the formula. Consumes the inputs. No randomness.
• Hatching: Requires an egg (obtained from gameplay or purchase). Gives a random pet. The egg is consumed, but you keep the pet. There is a chance of getting a high-rarity pet, but also a chance of a low one.

Fusing is more predictable and is the only way to guarantee a rarity upgrade, but it costs two pets. Hatching is cheaper if you have many eggs, but is luck-based.

Costs and Requirements

The fuse machine itself is free to use, but the real cost is the two pets you sacrifice. There is no in-game currency cost for fusing, but you must have two identical pets in your inventory. Some players wonder if there’s a level requirement – the machine is available from the start, but you need at least two duplicates to use it. There is no limit on how many times you can fuse, but each fusion consumes pets, so you’ll need a steady supply of duplicates.

Safety and Fair Use

Fusing is a core game mechanic, but there are a few things to keep in mind:

• Always double-check the pets you select. Once you confirm, there is no undo. If you accidentally fuse a pet you wanted to keep, it’s gone.
• Don’t fuse pets you need for quests or events. Some events require specific pets, and fusing them away can lock you out.
• Be aware of the rarity cap. The game caps at Legendary (5). Fusing two max-level Legendaries will still give a Legendary, so you won’t get a new tier.
• No real-money transactions are involved. The fuse machine is purely in-game, so there’s no risk of accidental purchases.

Frequently Asked Questions

Can I fuse two pets of different levels?

Yes, the pets can be different levels. The formula uses both levels, so a higher-level pet will give a slightly better result. For example, a Level 50 Common and a Level 1 Common would give (1+1+51/20)/2 ≈ 2.275, which rounds to 2 (Uncommon).

What happens if I fuse two Legendaries?

If you fuse two Legendaries (Rarity 5) at level 1, the result is (5+5+0)/2 = 5, which is still Legendary. At higher levels, it could exceed 5, but the game caps at Legendary, so you won’t get a new rarity tier.

Does the egg size affect the pet’s stats?

No. The egg size is just a visual indicator of the fused rarity. The actual stats are determined by the new pet’s rarity and level, not the egg. A Giant egg doesn’t mean the pet is stronger than a Large egg if the rarity is the same.

Can I fuse pets that are not duplicates?

No. The fuse machine only accepts two pets of the same species. If you try to fuse a Common and an Uncommon of different species, it will not work. They must be identical in type.

Is there any way to undo a fusion?

No. Once you confirm the fusion, the two pets are permanently consumed. There is no undo button or refund. Always double-check your selection before confirming.

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in pet1 | Pet 1 Rarity (1=Common, 2=Uncommon, 3=Rare, 4=Epic, 5=Legendary) | - | 3 | 1
in pet2 | Pet 2 Rarity (1=Common, 2=Uncommon, 3=Rare, 4=Epic, 5=Legendary) | - | 3 | 1
in lvl1 | Pet 1 Level | - | 10 | 1
in lvl2 | Pet 2 Level | - | 10 | 1
out fused | Fused Pet Rarity | - | round((pet1 + pet2 + (lvl1 + lvl2) / 20) / 2) | 0
out egg | Egg Size (1=Small, 2=Medium, 3=Large, 4=Giant) | - | min(4, fused) | 0