现代战争 异形 僵尸 直升机 刺客 血 重力 训练 genetic experiment insects PVP 死亡 士兵 军事 跑动射击 doctor Steam 血腥残忍 在线 陷阱 人工智能 夺旗 worm 彩蛋 查看全部 + 传送 giant insects mad scientist 沉默的主人公 攀爬 alien invasion one-man army darkness BOSS 战 爆炸 死亡竞赛 数字发行 平台独占 现代军事 语音出演 人类 3D 多边形 原声音轨 wasd movement 非玩家角色 profanity corpse sniping player vs player 混战 grapple a.i. companion 困难关卡 quicksaving quickloading inconvenient malfunction vending machine interaction 作弊码 scientist nuclear bomb interactive environments valve anti-cheat squad tactics particle system dimension travel team deathmatch not-so-bad guys dedicated servers alternative blood scripted events vent crawling jumping puzzle first-person platforming time paradox escaping imprisonment severed limbs arrival by crash landing text dialogue shooting range crash landing another world alien languages strafe-jumping missile launcher novint falcon support buddy system interactive achievement awards 2000