Portal 2 is a first-person Action Adventure Game developed and published by Valve in 2011.  

Portal 2 is a sequel to Portal, which was released in 2007.

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A first-person puzzle video Game is Portal 2. In the single-player campaign, the player assumes the role of Chell. In contrast, in the cooperative movement, they take on the roles of either Atlas or P-Body, two robots, or a crude humanoid icon in puzzles created by the community. These three characters are capable of environment exploration and engagement. Characters can only take so much damage before they pass away. The player character is instantly killed if they fall into bottomless holes or toxic waters. However, there is no penalty for failing onto a solid surface.

Exploring the Aperture Science Laboratory, a challenging, changeable mechanised maze, is the objective of both campaigns. 

The single-player mode of Portal 2 features many, a variety of brand-new puzzle elements, sneaky test rooms and a cast of interesting new characters.

The two-player cooperative version of the Game has its independent campaign with a unique plot, test rooms, and two new playable characters. 

Players are forced to reevaluate all they believed they understood about portals by this new mode. They will need to work together not just in terms of actions but also in terms of thought.

The Key Features of Portal 2 are:

• Long-lasting single-player mode: Boasting cutting-edge gameplay and an utterly captivating narrative.
• Full two-person co-op: Multiplayer Game with a dedicated plot, cast of characters, and gameplay.
• Massive sequel: More than 30 magazines from around the world named the first Portal the best Game of 2007.
• Advanced physics: Enables the development of an entirely new spectrum of intriguing problems, resulting in a Game that is larger but not harder.
• Unique music.
• Editing Tools: Portal 2 will include editing tools.

There is a cooperative two-player mode in the Game. 

Robots that each control a unique portal gun can access the other player-character portals. Each player has a particular gateway, one being blue and purple and the other being orange and red. A calibration room separates the characters to instruct the players on how to utilise the communication devices and portals. 

Players can converse verbally in the Game, and online players can briefly switch to a split-screen view to facilitating action coordination. Players can set countdown timers for coordinated actions, "ping" to direct the other player's attention to walls or objects, and make joint motions like hugging or waving. The Game accounts for the chambers each player has finished, and it lets players revisit Portals they've already finished with different partners.