Portal 2 is a critically acclaimed first-person puzzle-platform video game developed by Valve Corporation. Released in 2011, it serves as the sequel to the original “Portal” game. Players use a handheld portal device to solve a series of puzzles, creating linked portals to teleport objects and themselves. The game introduces new mechanics such as gel substances and cooperative multiplayer mode where players control robots. The story delves into the history of the Aperture Science facility, its AI GLaDOS, and introduces new characters like Wheatley. The game received praise for its innovative gameplay, engaging narrative, humor, and level design, earning it several awards and a place as a classic in the puzzle-platformer genre.