The Grand Hall Pest Control Merchant Request is the second Pest Control activity you can do in Resident Evil 4. The rules here remain the same. Find the rats and kill them. There’s more ground to cover here, making the rats somewhat harder to find than the previous Pest Control request.
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You’ll find one of the rats in the Dining Hall area. You’ll immediately find it running beneath the sofas after you enter the Dining Hall from the main Grand Hall corridor.
Make your way to the Armory to find the next rat. The rat is on the lower corridor that connects the Grand Hall and the Armory.
The final rat you’ll have to kill is in the corridor that leads to the Library. To get here, you must first find the Goat Head, the Lion Head, and the Serpent Head and attach those to the headless statue in the Grand Hall. This will then be followed by a section where you’ll have to play as Ashley. Once this section concludes, you’ll play as Leon again and you’ll be able to pass through the door to the right of the statue.
From here, you can head to the corridor that leads to the Library. The rat is on the corridor that’s filled with mounted animal heads.