The Factory Slime Event in Pet Simulator 99 invites players to gather event-specific Factory Coins by having their Pets produce and break open piles of Slime. Players engage in a dynamic cycle of acquiring new Pets and upgrading their facilities to maximize Factory Coin output. Reinvesting these Coins into enhancements drives a thrilling, tycoon-style gameplay loop.
Here’s a comprehensive guide on how to navigate the exciting Factory Slime Event in Pet Simulator 99.
Understanding the Factory Slime Event in Pet Simulator 99
Event Summary

Launched on April 5, 2025, the Factory Slime Event is a time-sensitive feature that concludes on April 12, 2025. Upon entering the event zone, players will notice a vast arena complete with a conveyor belt leading to the main gameplay section. To the left, you’ll discover the Egg vendor, which allows access to new Pets in exchange for Factory Coins. Initially, several Slime piles populate the play area, ready for players to break and kickstart their factory operations.
Once you’ve accumulated some Factory Coins, you can approach the conveyor belt to acquire stationary Pets that will help produce more Slime piles. Importantly, these new Pets do not replace your currently equipped ones, and upgrades are available to enhance their Slime production capacity.
On the opposite side of the arena lies the Upgrade Machine, where you can invest your Factory Coins to enhance the overall functionality of your factory. This station is crucial during the mid-game phase, boosting your chances of acquiring the coveted Huge Pet. Additionally, players can find Huge and Titanic Chests beside the machine, which yield various rewards when opened periodically.
Competition adds an exciting layer to the event, as players can check their positions on the leaderboard. Prizes are awarded based on your ranking at the end of the event duration, with the Top 10 participants receiving a Titanic reward. The first and second place will earn Rainbow and Golden rewards, while the remaining spots from 3rd to 10th will secure Normal prizes.
The leaderboard resides on the right side of the event area, with detailed statistics displayed on the prominent board at the far end of the arena.
Conveyor Eggs

To the left of the factory, interact with the Egg vendor to access the special Conveyor Egg, available for 50 Coins. You can enhance this Egg by interacting with the sign nearby to increase the rarity and variety of featured Pets at the cost of Factory Coins.
At the initial level (Conveyor Egg 1), players can unlock Pets such as the Spotted Elephant, Ooze Axolotl, and the rare Huge Ooze Corgi.
The following lists outline the Pets added with each Conveyor Egg upgrade:
- Conveyor Egg 2: Ooze Corgi
- Conveyor Egg 3: Knight Slime
- Conveyor Egg 4: Bubble Cat
- Conveyor Egg 5: Jelly Butterfly
- Conveyor Egg 6: Jelly Hydra
- Conveyor Egg 7: Firegel Dragon
- Conveyor Egg 8: Jelly Wizard
Each upgrade increases the cost of opening the Egg, escalating to a final price of 1 million Coins for the last level.
Conveyor Belt Pets

To acquire Pets from the conveyor belts, simply step onto the green buttons that appear in rotation. By purchasing multiple tiers of these stationary Pets across the three conveyor belts, you can optimize your Slime production. After placement, players can interact with each Pet to upgrade it using Factory Coins.
Given the necessity of accumulating millions of Factory Coins to excel in this event, prioritizing the upgrading of Conveyor Belt Pets is advisable for a swift rise on the leaderboard.
Factory Upgrades

Factory Upgrades can be acquired by spending Factory Coins at the beacon located on the elevated platform. These upgrades are essential for improving the overall efficiency of your factory, forming a vital aspect of your progression.
Below are the available upgrades you can purchase during the event:
- Better Chest Loot
- Enhanced Huge Chest Luck
- Improved Breakable Huge Luck
- Boosted Titanic Chest Luck
- Enhanced Breakable Drops
- Increased Damage
- Faster Breakable Spawning
- Increased Number of Breakables
- Speedier Conveyors
- More Coins Earned
- Improved Egg Huge Luck
These upgrades can be unlocked in stages, allowing for a gradual and satisfying progression in your factory operations.
Frequently Asked Questions (FAQs)
When does the Factory Slime event conclude in Pet Simulator 99?
The Factory Slime Event is set to wrap up on April 12, 2025.
Which is the rarest Pet available during the Factory Slime Event in Pet Simulator 99?
The rarest Pet obtainable in the Factory Slime Event is the Huge Ooze Corgi.