Deep inside a government research facility is where this game takes place. As a junior research assistant you get caught up in an alien invasion that takes you on a huge adventure. While you have is your intelligence to help you get through the facility as the aliens invades you also stumble upon some weapons to help you out. Your weapons range from crowbars to pistols and grenades to rocket launchers. This game has several modes for you to choose from, multiplayer mode to coperative mode. The action rarely stops with Half-Life.