Portal: Singularity Collapse
PuzzleExplore a new wing of Aperture Science focused on the creation of Portal Guns. Play as a scientist, traversing it's dilapidated remains after an unforeseen...
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Portal: Annihilation a free modification for Portal 2. All events take place in the alternate Portal universe, after the destruction of GLaDOS. It's 2037, the USSR has not collapsed and it has a Russian Aperture complex. The Russian complex is controlled by a new AI, as a replacement for GLaDOS. Take tests and survive in a complex not only with portals, but also with a modification of laser destruction.
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