Bring the shovel, magnet, and hammer; use the magnet on the left mouse hole for the key, click the hole again to draw out the mouse, then hit it with the hammer. This order is supported by multiple current achievement guides. Keep the shovel available because it is part of the cellar setup even when the magnet interaction is the visible answer.
What to do
- 01Bring the cellar tools.
Collect the hammer, magnet, and any shovel or weight the cellar route exposes before choosing the door.
- 02Pull the key from the mouse hole.
Take the left door, apply the magnet to the mouse hole, and collect the key when the interaction opens.
- 03Click the mouse hole, then use the hammer.
After taking the key, click the mouse hole again to force the mouse into the open, then quickly use the hammer on it to finish the Pest Control check. If the key is missing, re-check the shovel step rather than leaving the cellar.
Common questions
How do I unlock Pest Control?
Bring the hammer and magnet, take the left cellar route, use the magnet on the mouse hole, and finish the mouse interaction.