Key Points
- Rats in Quarantine Zone: The Last Check spawn randomly and cannot be farmed, making gradual progress across multiple runs the most efficient approach.
- Rat kills are tracked cumulatively across Campaign and Endless mode, so no progress is ever lost due to failure or restarts.
- Treat rats as background targets during normal gameplay rather than dedicated objectives to avoid unnecessary grinding.
Quarantine Zone: The Last Check puts us at a critical juncture in the middle of a zombie outbreak that humanity is struggling to survive. Gamers make use of screening tools as well as their own instincts to identify the infected and save what’s left of the human race.
Among the plethora of achievements and tasks are the Janitor and Rat Slayer achievements, directly tied to the number of rats you kill.
Quarantine Zone: The Last Check – Rat Achievement Overview
| Category | Details |
| Achievements tied to rats | Janitor, Rat Slayer |
| Janitor requirement | Kill 1 rat |
| Rat Slayer requirement | Kill 30 rats total |
| Progress tracking | Cumulative across all runs |
| Game modes | Campaign and Endless Mode |
| Best method | Shooting with sidearm |
| Spawn behavior | Random, no fixed locations |
| Recommended approach | Gradual kills over multiple sessions |
Where Rats Spawn and How to Spot Them
Rats can appear almost anywhere inside the compound. I’ve personally seen them near inspection corridors, storage areas, lab-adjacent zones, and quieter walkways between tasks. The Survivors Block is also a great place to come across Rats in the game. There is no fixed spawn point or timer, which is why trying to “farm” them rarely works.
Audio cues help more than visuals. The scurrying sound is often your first hint, especially during downtime between survivors. Keeping your sound on and your weapon ready makes a huge difference.
Best Way to Kill Rats Efficiently
Shooting rats with your sidearm is the most reliable method. Melee attempts are inconsistent and risky, especially when survivors are queued or tensions are high. A single bullet drops a rat instantly, and ammo usage here is negligible compared to combat situations.
The key is not overthinking it. If you see a rat, shoot it. Don’t abandon inspections or quotas just to chase one, because more will eventually spawn as long as you keep playing naturally.
Best Mode to unlock Rat Slayer Achievement Faster
Endless mode is ideal once you’ve completed most progression-based achievements. Without evacuation quotas or ending requirements hanging over you, you can freely move around the base and react whenever rats appear.
That said, you should never ignore rats during campaign runs. Treat them as bonus progress. By the time you reach late-game achievements like Brain Slam or Master Evacuator, you’ll often be closer to 30 kills than you expect.
FAQs
I cannot find any rats. What should I do?
This is completely normal. Rats do not spawn on a fixed timer or in guaranteed locations. From my experience, the best thing you can do is keep playing naturally instead of restarting runs. Longer sessions increase spawn chances, especially when moving between inspection areas, labs, and quieter corridors.
Do rat kills carry over between runs?
Yes. Rat kills are cumulative across all runs and modes. Even if you die, fail a campaign, or restart entirely, every rat you’ve already killed still counts toward Janitor and Rat Slayer.
Is there a specific location where rats spawn more often?
No confirmed hotspot exists. Rats can appear almost anywhere inside the compound, including inspection corridors, storage areas, and lab-adjacent spaces. I’ve had the most luck noticing them during downtime between survivor inspections.
