Metro 2033 (Stealth hardcore challenge walkthrough): Chapter 4 "Frontline"

Playlist: http://tinyurl.com/5s3574l Rules: - No mods, no cheats. - Hardcore difficulty. - Stealth (where possible). - Conserve ammo (Where possible). - No weapon purchases. - No human casualties (where possible). - Find as many weapon/ammo caches as possible without violating previous rule. - Recieve true ending.