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| developer = [[Valve Corporation]] | | developer = [[Valve Corporation]] | ||
| publisher = [[Valve Corporation]] | | publisher = [[Valve Corporation]] | ||
| released = | | distributor = Steam | ||
| modes = | | engine = [[Source Engine]] | ||
| released = 2012 | |||
| modes = Single-player | |||
| genre = | | genre = | ||
| requirements = See: [[Portal 2]] | | requirements = See: [[Portal 2]] |
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