: This was the first major free DLC for Portal 2, adding a new co-op track and challenge modes for both single and multiplayer.
: Another significant paper from Florida State University explores using Portal 2 for "stealth assessment," a method of measuring a student's learning and problem-solving abilities without using traditional tests. Portal 2 Free Download (v2022.11.19)
: The paper suggests that complex video games like Portal 2 provide a more effective "workout" for the brain because they require players to manage multiple variables and spatial relationships simultaneously. Related Free Content and Analysis : This was the first major free DLC
: A recently released free mod that expands the game's modding potential and includes new community-made maps and mechanics. Portal 2 Free Download (v2022.11.19)