Steal an Egg Dark Matter Mutation: How to Get It (2026)

To get the Dark Matter mutation in Steal an Egg, you fish in the Alien Biome. Finish the Alien Ferryman’s quest, then either claim free Dark Matter consumables from the Fishing Milestones or trade 1,750 Void Pearls for one at his trade-in tab. The first free one lands at just 30 catches.

Getting the item is the easy half. Each consumable only has a 30% chance to land on your egg, so where you spend it matters as much as how you earn it. This guide covers every route, the real cost per success, and which egg deserves the roll.

Dark Matter Mutation at a Glance

Detail	What We Know (Update 12)
Added in	Update 12, November 7, 2026
Where it comes from	Fishing in the Alien Biome and Alien Lagoon
Unlock requirement	Alien Ferryman’s quest (catch 20 fish), 250B Speed
Cheapest route	Free milestone reward at 30 catches
Trade-in cost	1,750 Void Pearls per consumable
Success chance	30% per attempt (reported)
Income boost	x2.5 (reported)
Codes	None. Any “Dark Matter code” is fake

The chance and multiplier are not printed in the patch notes. They come from player testing, so check the number on your own pet card after hatching.

What Does the Dark Matter Mutation Actually Do?

A mutation is a permanent income multiplier attached to an egg before it hatches. The pet that comes out carries a cosmic Dark Matter look, and it earns more money per second than a plain version of the same pet.

Income stacks in layers. A pet’s final earnings come from its base income, its size roll, and its mutation multiplier multiplied together. That is why a x2.5 boost on a tiny common pet is almost invisible, while the same boost on a heavy, high-rarity pet changes your whole base.

The mutation only goes on an unhatched egg. You cannot paint it onto a pet you already own, so the decision happens while the hatch timer is still running.

How Do You Get the Dark Matter Mutation in Steal an Egg?

There are three ways in, and they are not equal.

1. Fishing Milestones (free). Every catch counts toward the milestone track, and several tiers pay out Dark Matter consumables directly. This is the route to start with.

Fish Caught	Dark Matter Reward
30	1 Dark Matter Mutation
150	1 Dark Matter Mutation
400	2 Dark Matter Mutations
1,000	3 Dark Matter Mutations
2,000	3 Dark Matter Mutations
3,500	5 Dark Matter Mutations

Add those up and the track gives 15 free consumables through 5,000 catches. That total is our own tally of the published tiers, so confirm it in your in-game menu. The same list also awards pets that already carry the Dark Matter look, such as the Vexlet at 10 catches and the Bloomspire at 250. Our Void Pearls guide has the full milestone table.

2. The Alien Ferryman trade-in (1,750 Void Pearls). After his quest, a trade tab opens. Hand over 1,750 Pearls and you get one consumable. Pearls drop from fishing and from milestone payouts, and better rods multiply them.

3. Direct fishing drops. In-game tracking of Alien Biome catches suggests a small share of casts, reported at around 8%, can hand you a Dark Matter consumable outright. Treat that figure with caution until the developers confirm it. If it holds, steady casting beats saving Pearls.

Don’t trade Pearls for your first one. The 30-catch milestone covers it.

What Do You Need Before the Ferryman Will Trade With You?

Three gates stand in the way, and the first one stops most players.

• 250B Speed. This is the number most players report for the Alien Biome. One report says the Ferryman hands out a rod from 90B, but plan on 250B so you don’t waste a session. If your cast bounces back with a “fish are too fast” message, you are under the requirement.
• A fishing rod. The Halloween rod works, and the Ferryman lends you an Alien Rod if you have none. Our Haunted Rod guide shows where the old one comes from.
• The 20-fish quest. Talk to the Ferryman, catch 20 fish beside him, and the Alien Lagoon and the trade-in tab open together.

If you are still climbing toward 250B, finish that first. Our walkthrough on how to unlock the Alien Biome covers the route and the Speed math. The full fishing loop, including every rod, sits in the fishing guide.

How Do You Use the Dark Matter Mutation on an Egg?

The steps match the older mutation consumables, so the process will feel familiar if you have used one.

1. Place the egg you want to mutate in your base and let it start growing.
2. Open your inventory and move the Dark Matter consumable to your hotbar. You cannot use it from the inventory screen alone.
3. Equip it and stand next to the egg until the Apply Mutation prompt appears.
4. Hold E on PC, or tap the interaction button on mobile.
5. Read the result. A success attaches the mutation to the egg. A failure shows a “fizzled” message, and older consumables vanish when that happens, so plan as if Dark Matter does the same.

Do all of this before the hatch timer ends. If the prompt never appears, check that you are holding the consumable, standing at the egg, and that the timer is still ticking.

Is It a Gamble? The Real Cost of a Dark Matter Egg

At 30% per attempt, you need a little over three tries per success on average. The math is simple: 1 divided by 0.30 is about 3.3 attempts.

Route	Average Cost for One Success
Buying every attempt with Pearls	About 5,800 Void Pearls (3.3 x 1,750)
Using milestone consumables	3 to 4 free consumables per success
First free consumable only (30 catches)	One 30% shot at no cost

Those are averages. You can land it on the first try or burn five. That is why the free milestone consumables matter so much: they let you take the gamble without touching your Pearl stock.

Which Egg Should You Put Dark Matter On?

Put it on your best egg. Not a random one, and not one that might get stolen before it hatches.

A multiplier amplifies whatever is underneath it. A heavy egg with a high base income turns x2.5 into a real jump, while a small common egg turns it into pocket change. Pick the egg you would hatch into your top earner, then check where that pet sits in our Steal an Egg tier list and the all pets list before you commit.

Two habits protect your attempts:

• Stock up first. Interrupting a run to farm more consumables risks the egg hatching while you are away.
• Stay on one egg. Keep trying the same egg until you land the mutation, rather than spreading attempts across several.

How Does Dark Matter Compare With Other Mutations?

Dark Matter is a mid-to-strong boost, not the top of the ladder. Rainbow still sits higher on most trackers, and the Fractured mutation is reported slightly above Dark Matter. Its edge is access: a free route exists, and a 30% roll is generous next to the 10% rolls on older consumables.

The closest match is the UFO-era boost. The Alien Mutation (Abducted) also gives x2.5, but with 15% odds and a cost of 500 UFO Debris. Dark Matter doubles that chance at no currency cost if you use the milestone route. The Alien Mutation also needs Abducted eggs, which come from the UFO event, so it is harder to farm now.

Whether Dark Matter can stack with a second mutation on the same egg has not been confirmed. Older mutations have stacked when applied in order to a single egg, but nobody has published a clean Dark Matter test yet. Don’t plan a build around it until someone does.

Common Problems With the Dark Matter Mutation

• No trade-in tab. Finish the Ferryman’s 20-fish quest, then talk to him again.
• “Fish are too fast” warning. Your Speed is under the requirement. Train first.
• Apply Mutation prompt missing. Equip the consumable, stand at the egg, and check the hatch timer.
• Consumable gone, no mutation. That is a failed 30% roll, not a bug. Try again with the next one.
• Looking for a code. There isn’t one. Skip any site that promises a free Dark Matter code.

Details can change with each patch, so check your milestone menu for the live numbers, and keep an eye on the Steal an Egg updates when the developers rebalance fishing rewards. You can jump in and try it yourself in Steal an Egg.