戰慄時空：關鍵時刻 CD版
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戰慄時空：關鍵時刻 CD版 (2001)
Half-Life: Blue Shift
Gearbox Software
《戰慄時空：關鍵時刻》是Gearbox Software公司開發的關於第一人稱射擊遊戲《戰慄時空》的擴展包，於2001年6月12日發佈。和其他的擴展模式比如《戰慄時空：正面交鋒》一樣，藍色偏移是從故事的最開頭進行的，但是使用了不一樣的遊戲人物。遊戲的地點還是在黑色高地實驗室。主角想要逃脫外星人的控制，拯救即將失落的地區。
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