 The game retains Portal 's gameplay elements , and adds new features , including tractor beams , laser redirection , bridges made of light , and paint @-@ like ' gels ' accelerating the player 's speed , allowing the player @-@ character to jump higher or place portals on any surface . These gels were created by the team from the Independent Games Festival @-@ winning DigiPen student project Tag : The Power of Paint . In the single @-@ player campaign , the player controls protagonist Chell , awoken from suspended animation after many years , who must navigate the now @-@ dilapidated Aperture Science Enrichment Center during its reconstruction by the reactivated GLaDOS , a powerful supercomputer . The storyline introduces new characters , including Wheatley ( Stephen Merchant ) and Cave Johnson ( J. K. Simmons ) . Ellen McLain reprised the role of GLaDOS . Jonathan Coulton and The National each produced a song for the game . Portal 2 also includes a two @-@ player cooperative mode , in which the robotic player @-@ characters Atlas and P @-@ Body ( both voiced by Dee Bradley Baker ) are each given a portal gun and are required to work together to solve puzzles . Valve provided post @-@ release support for the game , including additional downloadable content and a simplified map editor to allow players to create and share test chambers with others . 
