yes it is
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.
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 comes out on April 18, 2011.
It will be on Mac the day Portal 2 is released.
Wait for Portal 2.
its from the game portal and portal 2
Misty
The time to preorder the game was 18 months ago when it was released and it will soon be time to preorder MW3 for it's November 2011 release. Many preorder bonuses come from the different retailers selling the game as a sales incentive and it depends on whom you are purchasing from to include all incentives available