Silent Move

Basic
Agility
Use the Silent Move skill whenever you want to creep about without making a noise. The Difficulty depends on the surface on which you walk—broken glass, twigs, gravel and so on, can all make extra noise. A Silent Move Test is always an Opposed Test, pitting your Skill against your opponent’s Awareness skill (or half their Perception if they do not have the Awareness skill).
A Silent Move Test is usually a Free Action made as part of a Move Action.

Ambush

You can attempt to sneak up on your opponent and ambush him. So long as you are not in combat and have not yet been noticed, you may make a Silent Move Test Opposed by your opponent’s Awareness Test. If you are successful, you sneak up on your opponent as though you had successfully Feinted in combat, and so long as your next Action is a Standard Attack, it cannot be Dodged or Parried. If your next Action is anything other than a Standard Attack then this advantage is lost.

Sneak

You can make yourself practically invisible when Shadowing an opponent. If you first succeed with a Silent Move Test, you gain a +10 bonus on your Shadowing Test.