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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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Quantum Tunneling Device
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johndb Jan 10 2013 says:

Looks so freakin' badass! Amazing art work!

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Jan 7th, 2013
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