The Aperture Science Handheld Portal Device returns and works as normal, but there are many additions to the original's set of tools and traps: there are Pneumatic Diversity Vents, Propulsion and Repulsion Gels, Thermal Discouragement laser beams, Aerial Faith Plates and more.
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While Chell remains silent, GLaDOS and the personality sphere Wheatley are full of character and are both hilarious and terrifying. While the original's story was only really hinted at, here it is fleshed out and you will learn a lot about Aperture Science and the characters in the game. On PC and Mac Portal 2 looks great, with rich detailed environments and excellent animation.