As always, players must solve a slew of test chambers by utilizing their portal gun, a device that allows them to place two portals on viable surfaces. This means that fans of the first game will not have to worry about an excessive amount of complicated new mechanics, although there are a few intuitive additions to note. In order to keep things simple and not overwhelm the player with new features, Portal 2 plays very similarly to the original. While this mode mostly serves as a way for players to test their skills at more complex puzzles with a pal, there is still plenty of witty humor to keep you laughing along the way. Designed to explore and test out puzzle rooms, these two robots must work in tandem to solve tricky and complex problems.

In this two-player adventure, you'll play as two test-robots named ATLAS and P-Body.

The cooperative mode features entirely new characters and an altogether different story, but it's much lighter in terms of narrative content and dialogue. If Chell wishes to survive another journey through Aperture Science, she'll need to use every bit of her wits. She is aided in her adventure by the personable floating robot Wheatley, while the villainous AI GLaDOS continues to torment her. As the building threatens to collapse, Chell must find a way to escape by using her trusty portal gun. After narrowly escaping the Aperture Science research facility in the original Portal, Chell finds herself trapped once again within its now crumbling walls. In the single-player mode of Portal 2, players once again step into the shoes of Chell, an unlucky test subject who continuously finds herself trapped and at the mercy of plotting machines.

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