Navigating the sprawling castle in the Resident Evil 4 remake presents players with numerous optional Merchant Requests that yield valuable Spinel rewards. Among these side missions, the More Pest Control request challenges players to track down and eliminate three elusive rats infesting the Grand Hall and Library areas. Completing this task requires careful exploration across multiple story chapters, making a detailed guide essential for efficient completion.

Starting the More Pest Control Request

The More Pest Control request notice is posted on the wall near the door leading to the Dining Hall in the Grand Hall area during Chapter 9. Interacting with this blue note officially registers the mission and tasks Leon with clearing out three rodents. You can turn in the completed quest to the Merchant at any point afterward to collect three Spinels.

Finding the First Two Rats in Chapter 9

The first rat is located in the hallway that connects the Grand Hall to the Dining Hall. Players can usually hear its squeaking sound as soon as they step through the door where the request note was found. Using a knife swipe or a handgun shot quickly dispatches the target before it runs away.

The second rat roams the corridor connecting the Grand Hall to the Armory. It can often be spotted scurrying along the carpet near decorative armor suits and treasure containers. Listening closely for rodent audio cues helps pinpoint its exact movement path.

Locating the Final Rat in Chapter 10

Players cannot eliminate the third rat immediately during Chapter 9 due to story constraints. You must wait until Chapter 10 when control returns to Leon after Ashley's gameplay sequence. The final target is situated in the dark corridor leading toward the Library and Mausoleum areas.

Because this hallway is dimly lit, activating Leon's flashlight is critical for spotting the rodent. The rat tends to move around rapidly, so tracking its squeaks ensures you do not lose sight of it. Once all three pests are eliminated, return to the nearest Merchant counter to claim your reward.