Dr. Scramble’s Revenge is update number six for Steal an Egg, expanding the scientist’s earlier appearance into a full world-boss fight. Dr. Scramble’s Laboratory takes the place of the old Rift trade-in machine. Samples now power the event economy: earn them through combat and exchange them for boosters, eggs, or one mutation.
Quick answer: The Rift is replaced by a Lab whose recipes each call for three specific eggs. A Mech boss appears about every 30 minutes and pays 1,750 Samples per defeat, while the free Boss Mastery path extends to 100 kills.
Dr. Scramble’s Laboratory replaced the Rift
The Laboratory now sits in the lobby beside the Shop, in the exact spot the Rift portal used to occupy. The big change is what it accepts. Instead of sacrificing hatched pets, you feed it three specific unhatched eggs gathered from different biomes, so there is no waiting to hatch anything before you can craft.
Three banners rotate through the Lab, with the available pool refreshing every hour. Required eggs depend on the active banner, so recipes aren’t fixed, and you’ll need to travel around the map for ingredients instead of farming a single zone. For example, one request may call for the Red Pandas Egg, Salamander Egg, and Snowy Owl Egg, all found in Cherry Blossom.
Each banner has its own displayed appearance rate when the rotation rolls:
| Banner | Chance shown |
|---|---|
| Biohazard Pets | 42% |
| Experimental Pets | 36% |
| Unstable DNA | 22% |
The crafting screen includes a pity counter and two free rerolls. During the update, the pity requirement dropped from 200 to 100; hitting that number guarantees the banner’s top reward rather than a random choice among its three best. Unstable DNA appears least often and offers the strongest results, including the Divine Octophant at around $4B/s and the Eternal Rhinobear. The Experimental banner’s highest rewards are the Eternal Dreadstinger ($2B/s) and Nuclear Mantis.
Because Unstable DNA shows up least often but pays the most, holding eggs until it rotates in is the efficient play rather than dumping them into a weaker banner.
The Dr. Scramble Mech boss fight
Dr. Scramble’s Mech is the update’s main attraction. A portal shows up on the map about every 30 minutes. Before combat, a “Dr. Scramble’s Coming…” countdown and brief cutscene depict the villain controlling Brockkodile to operate the suit. You can join with any bat, though stronger bats inflict more damage. The robot has around 13,300 HP and passes through three phases before the final chase on foot.
In the opening phase, players attack the mech body while dodging red slam zones and laser sweeps until it overheats and takes extra damage. The second phase adds hazards, with a robotic Brockkodile, homing drones, and bombs on the field, and the mech again drops into an overheat window where it is vulnerable.
Once the body collapses, the third phase exposes a shielded core inside a fleeing pod. The core locks onto one player, and it only becomes vulnerable after being lured into one of the small blue towers in the arena. The core must be broken three times.
After the core sequence, the suit fails completely and Dr. Scramble is exposed on foot. Three clean hits end the fight, sending him flying out of the Laboratory. Every win awards 1,750 Samples for a solo clear, plus scattered sample drops around the arena, and one Boss Mastery point. Damage dealt determines how many Samples each participant receives, and the fight is far easier with a full server.
Stay after the mech body vanishes. You must target the core before landing the last three hits, and the boss rewards are granted only once the whole sequence is finished.
Boss Mastery track and its rewards
Boss Mastery tracks completed victories, covering 1 to 100 kills over 22 milestones. The entire path is free, with no Robux option for skipping ahead. Most milestones award Biohazard, Experiment, and Unstable eggs along with their Scrambled versions; named pets become available at the higher thresholds.
| Kills | Reward |
|---|---|
| 1 | Biohazard Egg |
| 10 | Eye Bat #021 (Legendary) |
| 25 | Citadel Snail #007 (Mythic) |
| 50 | Uncoiled Armadillo (Cosmic) |
| 75 | Toxic Crocodile (Secret) |
| 100 | Pink Dragon Experiment #010 (Eternal) |
Because the boss only appears about every half hour, the 100-kill Pink Dragon Experiment #010 is a long grind rather than a weekend pickup — at the theoretical minimum of back-to-back 30-minute cycles, it works out to roughly 2.4 days of nonstop play. Mastery rewards are claimed manually from the green test-tube button on the left of the screen, so they are not added automatically after a win.
Samples and Dr. Scramble’s Experiments shop
The Experiments shop takes Samples as its only payment. Earn them by beating bosses or smashing Dr. Scramble’s drones in the timed drone challenge. Drones with more health take extra bat hits to destroy, but pay out more; hunting tougher ones across several biomes fills your stash faster than staying in one spot. You can collect well over 2,000 Samples in one event period.
The shop, found beneath the pet menu, turns those Samples into short-term boosters, two exclusive pets, and one mutation.
| Item | Cost (Samples) | Type |
|---|---|---|
| 2x Cash Booster (10m) | 275 | Boost |
| 1.25x Speed (5m) | 375 | Boost |
| 2x Treadmill Booster (10m) | 375 | Boost |
| Scrambled mutation | 475 | Egg mutation |
| Nibbles #013 | 2,950 | Pet |
| Experiment #001 | 6,500 | Pet |
Of the three, the 1.25x Speed boost is the most useful because it makes borderline nests dependable to steal from. The Treadmill Booster doubles treadmill speed, making it better for focused speed grinding than for use mid-steal. Experiment #001 costs the most and has a one-purchase limit, so players commonly save Samples for it before buying anything else.
Feeding parasite-infested eggs to the Hungry Monster chest by the safe zone can also award the 1.25x Speed and 2x Treadmill boosters, making it sensible to hold onto Samples for the specific uptime you need.
How the Scrambled mutation behaves
Scrambled costs 475 Samples and is a one-time consumable applied to an egg before it hatches and grows. It succeeds about 10% of the time, so failed attempts are common and keeping several spares is normal. Because the mutations stack in your inventory, buying multiples during a shop visit is worthwhile. A “Scrambled mutation applied!” notification confirms the egg now carries the mutation. If an attempt refuses to register, turning off other equipped pets in settings and trying again is the usual fix. The payoff scales with the egg underneath, so it is worth the most on high-rarity steals from Titan Temple or the Angels and Demons zones.
The Extinction Egg is a separate Robux purchase
The featured shop rotation brought in the Extinction Egg, a paid hatch available for a limited time and separate from free Lab and boss progression. Its contents include six base extinct animals, among them the Glyptodon, Giant Sloth, Sabertooth, and Terrorbird, as well as a rare Skeletal reroll linked to the skeletal mutation system. A Legendary Glyptodon generates $155K/s.
| Bundle | Price |
|---|---|
| 1 Extinction Egg | 99 Robux |
| 3 Extinction Eggs | 249 Robux |
| 10 Extinction Eggs | 799 Robux |
| 50 Extinction Eggs | 3,499 Robux |
The featured listing is on limited sale through October 10, 2026. Buying it requires no boss win or Lab submission; it’s a direct Robux purchase, not a way to bypass Samples, pity, or Boss Mastery. Limited-sale prices may change, so check the featured panel before you buy.
The secret cave, vault quest, and hidden rooms
There is also a side quest running alongside the main event. Nibbles—an escaped experiment known as Experiment #013—is hidden in a Secret Cave in the Abyss Ocean biome’s left-hand wall. Speak with him to access the Stolen Experiment Vault; repairing it takes five parts.
Two Lost Parts have fixed locations in the world: one is inside the Volcano, and the other is behind the bush in Prehistoric near the sleeping T-Rex. The other three are Drone Parts, which randomly drop from Dr. Scramble’s drones during the event; the vault shows separate counts for the two part types. Collecting all five earns the limited Scrambler bat.
A wall vent close to Nibbles leads to a small, workshop-like hidden room that hints at the next part of Dr. Scramble’s story. The map also features a concealed Fusion room, where the Divine and Eternal fusion pads sit beside each other.
Event window and the next biome teaser
According to the official event record, it runs from September 26, 2026 at 11 a.m. ET until noon ET on September 27, 2026. The Mech portal’s appearance within that period is controlled by the in-game timer, and you can battle the boss in a private server for a solo fight.
After Dr. Scramble is defeated, a final cutscene shows Ben releasing Brockkodile from mind control as a huge cosmic whale glides into view. The words “NEXT WEEK NEW BIOME…” appear above a seven-day countdown, clearly signaling the next area the developers are preparing. That biome still has no confirmed public release date. Overall, the update lets players earn everything through grinding rather than paying to skip ahead: the boss, Mastery track, and Sample shop all reward time instead of Robux.
