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A total conversion mod of Alien Swarm based on Portal 2.
Through your travel in the time tunnel of Retrospective you'll re-discover Aperture Science in 1960, where you'll meet pre-historic creatures, will confront giant chickens, find time holes, fight radiactive zombies, mantis men and many other creatures, You can explore the old Aperture Science alone or in a mixed quest with your partner in science, through the co-operative mode.
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