Portal 2 sex
Portal 2 challenges the player to use teleportation to traverse obstacle courses.
The player's speed does not change upon passing through portals.
The initial tutorial levels guide the player through the general movement controls and illustrate how to interact with the environment.
The player must solve puzzles using the 'portal gun' or 'Aperture Science Handheld Portal Device', which can create two portals connecting two distant surfaces depicted as matte white, continuous, and flat.
A promotional comic shows estranged Aperture Science employee Doug Rattmann, who used graffiti to guide the player in Portal, placing Chell into suspended animation to save her life, until the beginning of Portal 2.
Wheatley (Stephen Merchant), a personality core, guides her through the old test chambers in an attempt to escape.In this example, the vertical velocity of the falling character is converted into horizontal velocity by the portal.