The first and main half-life game when I first played it I really enjoyed it, then I got opposing force, and it was to me a fantastic addition to the half-life mod collection! Finnaly, fight along side soldiers and as one, the marines that gave you trouble in the first game, you are now one of them! Opposing force is packed with new weapons and aliens, plus more advanced marines than the last half-life, use engineers to cut through sealed doors, the medic can heal you, and your friendly soldiers, but only for a limited time, besides the point, There is one thing that disturbes me about this game like the last one, the ending, NO not the adminstrator g-man again! He follows you everywhere, then talks to you about sending you to a place and the end! But, I would reccomend this to gamers who are half-life fans , and to the ones especcially who like marines! Graphics:Not much changed from the last one. Sound:New sounds, but not much changed. Control:Like the last gameOverall:A fun fantastic game! ps. Multiplayer rocks just as much in this one as the last main game as well!