The Stolen Experiment Vault is a damaged machine tied to the Dr. Scramble event in Steal An Egg. To repair it, you collect five separate Vault Parts, then hand them back to the escaped experiment hiding in the Abyss Ocean biome. The catch is that the parts come from two very different places, which is why players often get stuck halfway through.
Quick answer: You need five pieces for the vault: two set Lost Parts—one in the Volcano biome and one in the Prehistoric biome beside the T-Rex—along with three Drone Parts. Dr. Scramble’s drones drop the Drone Parts randomly and appear every 30 minutes.
Start the Stolen Experiment Vault quest in Abyss Ocean
The quest is not marked on your map, so you have to find the giver yourself. It lives inside a hidden cave in the Abyss Ocean biome, the seventh level, which sits between the Prehistoric and Volcano biomes.
Speak with Nibbles before searching. Until the quest is active, your tracker may fail to record Drone Parts, so first verify that its counter shows the parts you still need.
The two Lost Parts in the Volcano and Prehistoric biomes
Two of the five parts sit out in the world in the biomes next to Abyss Ocean. Grab these first, since they do not depend on the drone timer. If a spot looks empty, try one fresh server before assuming you missed it, as part spawns can vary between servers.
Lost Part in the Volcano biome
Head to the Volcano biome and move to the center. Look for the small volcano-shaped structure near the wall with lava on top. The part is tucked inside it, so clip through the bottom of that structure to reach the hidden space. Some players report the spot sits high up, so a launch from another player or a taller avatar can help you reach it.
Lost Part in the Prehistoric biome
In the Prehistoric (Jurassic) biome, continue beyond the giant bones to the dinosaur standing with eggs in front of it. Search immediately behind the T-Rex’s head, either in the grass or behind the bush near the biome’s Guardian, then walk across the part to pick it up.
The three Drone Parts from Dr. Scramble’s drones
The final three parts only come from defeating Dr. Scramble’s drones. A fresh batch spawns across the map every 30 minutes, appearing near the same spots where regular eggs show up. Each drone has 5 HP, so hitting it five times with your baseball bat brings it down.
Three drone types roam the map, and each one can drop a Drone Part when killed. Drops are random, so a defeated drone will not always hand over a part. Higher-HP drones tend to pay out more Samples, the event currency used in the Experiment Shop.
| Drone type | HP | Drops |
|---|---|---|
| Scrap Drone | 5 | Samples, chance at Drone Part |
| Reactor Drone | 5 | Samples, chance at Drone Part |
| Augmented Drone | 5 | Samples, chance at Drone Part |
Because the drop is pure chance, plan to clear several waves. Use the gap between spawns to sweep the biomes for the two Lost Parts, then focus entirely on drones the moment a wave appears. Keep your bat equipped before the countdown ends so you do not waste the short window opening menus.
Claim the Scrambler and complete the vault
Once you hold all five parts (two Lost Parts plus three Drone Parts), return to the Escaped Experiment in the Abyss Ocean cave. Open the Stolen Experiment Vault window and select Claim to repair the vault. Completing it unlocks the limited Scrambler bat, and the vault screen updates to confirm the repair is done.
The Dr. Scramble event controls this entire quest and ends on September 26, 2026, so open the vault before the event changes. Roblox then follows it with Dr. Scramble’s Revenge, scheduled for September 26 at 3:00 PM UTC through September 27 at 4:00 PM UTC, which begins the storyline’s next chapter.
