Pet Simulator 99 Slime Factory Guide Best Method to Grind Fast!

The Slime Factory update in Pet Simulator 99 is here, and while the event is packed with chaos and slime galore, there’s a surprisingly efficient grind method tucked inside. If you’re trying to figure out how to stack up slime coins fast, upgrade pets efficiently, and make the most of your time without wasting Robux, this guide breaks it all down.

What Is the Slime Factory?

The Slime Factory is a new mini-game-like event in Pet Simulator 99 where pets are placed on conveyor belts to generate slime breakables. As they “work,” they produce slime, which other pets consume. The setup resembles more of a tycoon than a typical simulator, but it’s oddly effective once you know what to do. Each of the three conveyors can hold five pets, and the whole goal is to get your pets puking and eating slime as quickly as possible to generate slime coins, which are then used for upgrades, pets, and more.

Step 1: Start With Basic Conveyor Setup

Once you’re in the Slime Factory:

• Place your first few pets on the conveyor belts.

• Focus on filling at least one full conveyor to start slime generation.

• Watch how the smaller pets produce slime, while the larger ones consume it in a weirdly cyclical system.

At this point, don’t worry about the quality of your pets. Just get the system running.

Step 2: Grind Until You Reach 1 Million Coins

You’ll earn slime coins passively as the system works. Early on, you may not make much, but once the factory is going, things snowball:

• Let your pets grind.

• Avoid spending coins on eggs too early.

• Don’t worry about boosters yet—focus on letting it run in the background while you do other things.

With a basic setup, it shouldn’t take long to reach around 1 million slime coins.

Step 3: Upgrade One Pet to Max — This Is Key!

Here’s the real game-changer. According to many players (and confirmed in the video), the best strategy is:

Only upgrade ONE pet to MAX level first.

• Pick a pet and funnel all your resources into it.

• As it levels up (e.g., level 40 → 85 → 95 → MAX), your coin gain increases drastically.

• Don’t spread your coins thin trying to level multiple pets early.

This single upgrade boosts your earnings much faster than trying to upgrade evenly.

Step 4: Invest in Conveyor and Breakable Upgrades

Once you’re making solid coin flow, head to the Upgrade Machine at the back:

• Prioritize upgrades like More Breakables, Faster Conveyor, and More Coins.

• Ignore luck and friend boosts until later unless you really want to roll for huge or Titanic pets.

• Use coins wisely—upgrades get expensive quickly.

If you still want to try for exclusive pets, wait until your coin income is solid before spending.

Step 5: Use Friend Bonuses (Even if You Don’t Have Friends)

If you’re soloing the game, you can still use friend boosts:

• Generate your server invite link.

• Share it on Twitter, Discord, or wherever players gather.

• Even randoms joining your server count toward your Hatch Luck, Coin Boosts, and Breakable Spawns.

You’ll see a noticeable difference once you get 3–5 extra players in your session.

Step 6: Optional – Boosters & Forever Pack

If you’re willing to spend Robux, the Slime Forever Pack offers extra boosters and exclusive pets:

• Boosters include coin multipliers and faster spawn rates.

• Not necessary to progress, but can help speed things up significantly if you want to spend.

However, even without Robux, the method of maxing one pet and upgrading smartly is more than enough.

The Slime Factory in Pet Simulator 99 might seem chaotic at first, but once you understand the loop, it becomes a goldmine—literally. Focus on upgrading one pet to max, optimizing your conveyor upgrades, and leveraging passive coin gain through friends and automation. It’s a surprisingly deep system that rewards efficient planning over pure luck.