Half the game is single-player and the other half is co-op (2 players). They each take around 3-4 hours to complete.
unless your playing minecraft portal mod and portal
Yes it is but there is co-op where you can be P-body or atlass
Portal or Portal 2 mods on Steam is installed by first Downloading it and extracting it. Then copy the map file into your Portal 2 maps folder which is Run the game.
Yes and Portal 2.
No, Portal is for PC only. Portal 2 is for PS3,Xbox 360,and PC. Plus it would suck on PSP.
Portal - 2002 Portal 2-21 was released on: USA: 18 November 2003
Portal 2
Chell is the main player character in the Portal video game series. Chell appears in Portal and Portal 2. Chell was modeled on Alesia Glidewell and was voiced by Mary Kae Irvin.
There are two modes: one single player and the other is multiplayer. So yes, it is.
That is up to the player to decide. It has received some very favorable reviews, though.
Portal 2 is a co-op game rated E10+
Portal 2 comes out on April 18, 2011.