半衰期：蓝色行动 CD版
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半衰期：蓝色行动 CD版 (2001)
Half-Life: Blue Shift
Gearbox Software
《半衰期：蓝色行动》是Gearbox Software公司开发的关于第一人称射击游戏《半衰期》的扩展包，于2001年6月12日发布。和其他的扩展模式比如《半衰期：针锋相对》一样，蓝色偏移是从故事的最开头进行的，但是使用了不一样的游戏人物。游戏的地点还是在黑山研究所。主角想要逃脱外星人的控制，拯救即将失落的地区。
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