When was the game 'Portal 2' released?

Portal 2, a popular puzzle-platform video game developed and published by Valve Corporation, was released in 2011. The sequel to the original Portal game, Portal 2 introduced new characters, extended gameplay mechanics, and a more elaborate storyline. It featured an immersive single-player campaign as well as a cooperative multiplayer mode, further captivating players with its innovative portals and challenging puzzles. The game garnered critical acclaim upon release, praised for its clever design, humor, and engaging gameplay experience.