I made a collection of videos that show the methods I found to use the least portals for all maps of the single player. Put together it's possible to beat the game using only 60 portals. To do that some cool strategies are used, so have a look at the videos:
http://www.youtube.com/view_play_list?p=9FF54BC25AE9572B

Ah, and I didn't use wallclimbing or other such glitches for this, in case you were wondering about the high portal count

Jaso wrote:
I made a collection of videos that show the methods I found to use the least portals for all maps of the single player. Put together it's possible to beat the game using only 60 portals. To do that some cool strategies are used, so have a look at the videos:
http://www.youtube.com/view_play_list?p=9FF54BC25AE9572B

Ah, and I didn't use wallclimbing or other such glitches for this, in case you were wondering about the high portal count

very nice. i've seen some of these before. but its a nice playlist! haven't watched them all yet. probly will soon though

the glados battle one was infuckingcredible!!