Game Description: Half-Life features an integrated storyline with stunning visual effects and a huge, sprawling environment filled with aliens determined to hunt you down and kill you. You no longer just point and shoot—Half-Life is a dynamic, plot-driven, complex world where you need to play smart to survive. Monsters have a strong instinct for self-preservation. They will duck, jump, hide behind barriers to avoid gunfire, and even retreat if feeling threatened. Superior AI drives these behaviors and they are different for each species. Plus you can choose from 18 different weapons, ranging from a crowbar to laser-guided rockets.