Portal 2 is a first-person puzzle-platformer developed by Valve and released in 2011. It expanded significantly on the "test chamber" formula of its predecessor, introducing new mechanics like tractor beams, lasers, and light bridges. The Core Experience
Players who mastered the first game may find the sequel easier because they have already learned to "think with portals," though the puzzles themselves are more complex. Safety Note File: Portal.2.Complete.zip ...
A separate campaign featuring two robots, Atlas and P-Body. While some critics from A Critical Hit! feel the story is slightly lighter than the solo campaign, it is widely considered one of the best co-op experiences ever made. Portal 2 is a first-person puzzle-platformer developed by