You'll need a skilled partner though, as these puzzles require both quick-thinking and fast reflexes. If you're really looking for a challenge, you can find exceptionally tricky puzzles in the standalone cooperative mode. Like anything in Portal 2, gels seem simple at first, but you'll find yourself using them in interesting ways as you progress to later puzzles. These orange and blue liquid-like substances cause your character to speed up and bounce around, which can be used in tandem with launch-pads and other environmental features. Of the new mechanics that Portal 2 introduces, the Propulsion and Repulsion Gels are the most game-changing. Even hazardous items like turrets and lasers can be used to your advantage if you properly place a portal. While it sounds pretty simple, things can get deceptively complex, requiring you to think outside the box.

By placing the portals in certain places and at certain angles, players can then reach the exit or hit triggers to complete the room. 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. The unchanging developer Valve Corporation has created a new story, the plot takes place many, many years after the events in the original Portal. 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. Version: 2.0.0.1 UP4 (from ) Description: Portal 2 is the long-awaited sequel to the game that has won the hearts of many gamers. 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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