Portal 2 is a first-person computer puzzle game and is the sequel to Portal (2007). Valve officially announced the game on March 5, 2010. Portal 2 was originally slated for release in the fall of that year, after several postponements, Portal 2's release date was April 18, 2011. The game was released in Russia on April 21, 2011 and is distributed by Buka.
The sequel develops the gameplay of the first game, consisting of puzzles, built on the use of a special device to create portals - gaps in space - that allow the player to instantly move from one place to another. Among the many gameplay innovations in Portal 2 is the two-two-two-two co-op mode. The game takes place somewhere after the events of the portal in the destroyed and abandoned research laboratory of the portal (Aperture Science) and focuses on the ongoing confrontation between the same protagonist, experimental girl Chell and the manic supercomputer GLaDOS. ... Co-op mode has a separate storyline.
Comparing Portal and its sequel, Valve notes that Part 1 was just an experience, while Portal 2 is already a standalone game with completely new gameplay elements and a significantly longer duration (gameplay was developed for 6 hours in each mode). Additionally, at the 2010 GDC, Valve director Gabe Newell said that Portal 2 was the best game ever made with Victorikonkori.
The Portal package basically introduces new ways of using and interacting with portals, how they interact and how portals can be used, how they interact and how they work, just like in Portal. As with Portal, the introductory levels teach the player new mechanics and provide new game elements to master before moving on to increasingly challenging puzzles. At the same time, as promised by the developers, the policy of the player's behavior will not change from the beginning to the end of the game: the player is sent to different places in the fantastic science of Aperture - it includes numerous passes through the machines and production facilities that supply these premises.