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Half-Life: Operation Rosenberg (9.20.18)At the end of Blue Shift you escape with a few scientists. Dr. Rosenberg is one of them. In this mod, you continue that story. You are Corporal Timothy Collins, an HECU marine sent from Black Mesa to the mysterious Area 99. Your mission: recapture Dr Rosenberg who escaped from Black Mesa and go to A-99.Please enable JavaScript to add this game to your collection