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[[Turtle Rock Studios]] announced on March 16, 2006 they would be working with Valve on a "Source On January 10th, 2008, Turtle Rock was acquired by Valve and renamed as Valve South. You can read the Press R

...Valve 最终将这个任务交给 Ritual Software，但 Ritual 的尝试最终并未让 Valve 满意。最终 Turtle Rock Studios 与 Valve 共同完成了''零点行动''，而 Ritual 所制作的战役� {{Counter strike games}}

...f a viral strain transforming people into zombie-like feral creatures, the games follow the adventures of four survivors attempting to reach safe houses and ...rted development as a side project called "Terror Strike" by [[Turtle Rock Studios]] during development of {{czero|2}}, and continued development alongside {{

...Scenes veröffentlicht. Condition Zero wurde schlussendlich von Turtle Rock Studios sowie Valve Software finalisiert. {{Counter strike games}}