The "Half-Life [1, Original] - Opposing Force Expansion" CD-ROM game for PC, released in 2001, offers players a mature-rated first-person shooter experience set in the Half-Life series universe. Published by Sierra Studios, this expansion pack adds new content and gameplay to the popular Half-Life franchise. With a focus on intense action and immersive storytelling, this NTSC-U/C (US/Canada) region-coded game is sure to provide hours of entertainment for fans of the genre.