True stealth in MGS:PO goes beyond simply avoiding vision cones. Master these techniques for unparalleled infiltration:

- Sound Management: Every action has a sound. Running, firing unsuppressed weapons, and even crawling on certain surfaces can alert enemies. Walk or crawl slowly when near enemies. Use silenced weapons exclusively for stealth runs.
- Environmental Interaction: Use the environment to your advantage. Knock on walls to distract guards, hide in lockers or under trucks, and use tall grass for cover. Throw magazines to create diversions.
- CQC Choke & Drag: Instead of just knocking out enemies, use CQC to choke them out and then immediately drag their body to a hidden location. This prevents other guards from finding them and raising an alert.
- Interrogation: Hold up enemies and interrogate them for valuable information, such as enemy positions, item locations, or even blueprints. This is a non-lethal way to gain intel.
- Disguises: Enemy uniforms are powerful, but not foolproof. Higher-ranking guards may still recognize you. Avoid direct eye contact and suspicious movements.
- Radar Awareness: Constantly monitor your radar. Pay attention to enemy vision cones and their patrol paths. Anticipate their movements to plan your route.
Combining these techniques will allow you to complete missions with a perfect 'No Traces' rating, which often yields better rewards.
Compare advanced stealth techniques inMetal Gear Solid 2: Sons of Liberty