silence

Exploration Stage: Octopus Citadel
From: Mr. Black
Description: Once you're through this hallway, turn right next time, and if no one has noticed you at that point, you can go into Violet's office. Oh no... the floor is making a creaking noise. If we don't do something, we'll be noticed! If this happens, we'll have to use a noise-freezing machine. It's a machine that will eliminate unnecessary noise.
Completed: It worked. All the footsteps are gone. This machine has saved my life many times. It muffles all sounds within a half-meter radius. The noise freezer is a powerful device that can even muffle the sound of gunfire.