The Half-Life Opposing Forces Big Box PC Games CIB offers fans of the Half-Life series a complete experience with its survival shooter gameplay and M rating. Published by Sierra in 1999, this NTSC-U/C (US/Canada) release includes the game, owner's manual, and is guaranteed to provide hours of immersive gaming experience. With its engaging storyline and intuitive gameplay, this classic shooter is a must-have for any PC gaming enthusiast looking to delve into the world of Half-Life.