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Alien Swarm is a free top-down shoot-em-up video game by Valve Corporation. It is a remake of the Alien Swarm mod for Unreal Tournament 2004, and it was developed by the original team, which was hired by Valve during the course of the development process.
Source SDK是由Valve Software编译的软件开发工具包，用于为Source引擎创建地图或模组，但不包括《求生边缘》、《求生边缘2》和《异形：地球崛起》。这些游戏各自配备了专用的SDK，称为《求生边缘》作者工具……
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Alien Swarm is a free top-down shoot-em-up video game by Valve Corporation. It is a remake of the Alien Swarm mod for Unreal Tournament 2004, and it was developed by the original team, which was hired by Valve during the course of the development process.
Source SDK是由Valve Software编译的软件开发工具包，用于为Source引擎创建地图或模组，但不包括《求生边缘》、《求生边缘2》和《异形：地球崛起》。这些游戏各自配备了专用的SDK，称为《求生边缘》作者工具……