if you don't know how to get it click here: Link: [hide]http://store.steampowered.com/app/400/[/hide] Warning: It says free but many have had error when they click install and it didnt install...like me currently
http://kotaku.com/5840920/for-the-next-few-days-portal-is-free Seems there is a deadline for this. Grab it now.
PORTAL IS FREE TILL 20th SEPTEMBER DL IT NOW Source GO DOWNLOAD IT NOW ... IF YOU HAVENT PLAYED IT I RECOMMEND IT SOOO MUCH !!!!! ONE OF THE BEST GAMES I HAVE EVER PLAYED