Parasite Testing Codes (July 2025)

Looking for active Parasite Testing codes? We’ve got all the working codes for this Roblox experience, so you don’t have to search for them. Redeem each one for rewards like credits to buy weapons or leveling up to access the armory sooner!

Working Parasite Testing Codes (July 2025)

Here are all the current active codes you can redeem in Parasite Testing as well as the rewards you’ll get from them:

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• PUPPETEER – 50 Credits, 10 Levels

Expired Parasite Testing Codes (July 2025)

The below codes have unfortunately expired and will no longer work. We’ve included them here so you know not to bother trying to redeem them:

• ACOLYTE
• 2KSERVER
• 1M VISITS
• 1KSERVER

How to Redeem Parasite Testing Codes

Redeeming codes in Parasite Testing isn’t too hard once you know where to look. Follow these simple steps to start getting those rewards:

1. Launch Parasite Testing
2. Interact with the laptop in the first room you spawn in. You can see it in the screenshot above.
3. Enter a code in the box that says, “Enter a code…”
4. Press the big green Submit button to redeem your code.

Why Isn’t My Parasite Testing Code Working?

If you’re having trouble redeeming a code, there are two common reasons why it may not be working:

• The code is expired
• The code has been entered incorrectly

If a code has been entered incorrectly or has expired, you’ll see a message that says, “Not a valid code”. In order to avoid this, we recommend copying and pasting the code directly from this article. As long as you don’t accidentally get an extra space in there when copying it, it should work if it’s active. We make sure to check and test every Parasite Testing code before we add them to this article.

Where to Find More Parasite Testing Codes

We always recommend checking our article here for up to date codes since you can rely on us to verify which ones are working. But, if you’d prefer to search for some Parasite Testing codes on your own, you can check the dedicated Discord server.

What is Parasite Testing in Roblox?

Parasite Testing is a Roblox experience that revolves around shooting eldritch creatures. A large red biomass will keep spawning parasites that evolve when attacking players. If you let them get too close, you’ll become infected and have to worry about your teammates taking you out. Depending on the parasite type, you’ll either respawn or can fight researchers while infected.

Eliminating creatures and infected players will give you credits and level you up. This will help you unlock new weapons for taking on tougher creatures. But you can also use traps to wipe out hordes of parasites via decontamination or electricity.

Jeffrey Lerman is a freelance game journalist for IGN who has been covering games for over a decade. You can follow him on Bluesky.