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Portal 2 will continue to challenge the player by solving puzzles in test chambers within the Aperture Science Enrichment Center using the portal gun (the Aperture Science Hand-held Portal Device), a device that can create two portals connecting two surfaces across space. Players, as the silent protagonist Chell from Portal, solve puzzles by using these portals to move unconventionally between rooms or to use the ability to fling objects or themselves across a distance. The functionality of the gun has not changed between the games, but within Portal 2, players can take advantage of the bleeding of other physical effects through the portals. Game Informer identified two examples of this: one was the ability to use air currents created by Pneumatic Diversity Vents, a series of transport pneumatic tubes, through a set of portal openings to push a turret over or to draw objects into the suction. The second example was to use the power of Excursion Funnel tractor beams through portals to bring Chell or other objects to otherwise inaccessible areas. The game also introduces special paint-like gels that can be used to impart certain physical effects to a surface such as Propulsion Gel that boosts Chell's speed as she crosses a surface, and Repulsion Gel that allows her to jump from a surface.The player will be required to determine how to transport that gel to appropriate surfaces using portals in order to progress.The gels can also be applied to objects, such as the Weighted Storage Cube crates, that affect their own physical nature.In addition to the Storage Cube, there are new types of portable objects that assist the player, including Redirection Cubes with mirrored, reflective surfaces used to redirect Thermal Discouragement laser beams, Aerial Faith Plates that can launch objects placed on them, and spherical Weighted Storage Balls, which made a brief appearance in the original game in one of the advanced chambers.
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