Portal 2 will have a co-op campaign. Players take control of a robot and work through puzzles that require two players to work together to solve.
More Info @ PCGamingWiki
The sequel to Portal, this first person puzzle game has players controlling portals to navigate a science lab.
This page contains co-op info for Portal 2 on the PC. All information about Portal 2 was correct at the time of posting. Information is subject to change. If you see any errors please email us.