Portal 2 is a first-person puzzle game where players use a “portal gun” to create linked portals on flat surfaces, solving intricate puzzles to advance through the game. Set in a mysterious and often humorous testing facility, players navigate through a series of test chambers while uncovering a deeper narrative involving artificial intelligence and the facility’s dark past. The game features a compelling single-player story, cooperative multiplayer mode with unique challenges, and a variety of new gameplay mechanics introduced alongside the classic portal-based puzzles.