Half-Life 2: Episode Two (2007)

helicopter bloody death run and gun steam achievements artificial intelligence one-man army boss fight explosion steam achievements digital distribution voice acting human polygonal 3d original soundtrack release wasd movement profanity sprinting mechanics melee auto-saving a.i. companion difficulty level destructible environment evolving title screen weapons swap plot twist linear gameplay character models based on actual people trilogy tragic hero novint falcon support male protagonist swimming single-player only particle system retail games with steam activation instant kill bink video non-player character ragdoll physics dog crow scripted events gnome comic relief undead throwing weapons vent crawling aliens dystopian robots apocalypse terraforming radiation male antagonist doctor mad scientist descendants of other characters quickloading xbox controller support for pc falling damage scientist interactive environments fully customizable controls insect infestation machinima steam cloud useable vehicles unreliable narrator cheat code dynamic difficulty silent protagonist checkpoints resistance environmental puzzles physics manipulation biotechnology foreshadowing first-person platforming cliffhanger alien invasion gravity infinite ammo environment as weapons motion blur in-engine cinematic evil organization agents escaping imprisonment levitation episodic developer commentary steam play wormhole professional gaming robot dog gunship zombies strafe-jumping vehicles to be continued buddy system bugs hunter balance platforms mp7