"Open door stealth" appearing in the drop down menu (Chaos Theory)
Rating system (Chaos Theory)
Optic cable zoom levels (Double Agent V1)
Sam looking at things you can interact with (Chaos Theory)
Pressing jump to quick drop bodies (Chaos Theory)
Enemies dropping their gun when killed (Chaos Theory)
Secondary dialogue only playing once (Double Agent V2)
Cutscene skip (Double Agent V2)
Ability to see computer emails directly (Chaos Theory)
Sam automatically raising his legs up when going into tight spaces on a pipe (Chaos Theory)
Variable speeds during weapon mode and grabs on mouse (Chaos Theory)