Portal is a first-person puzzle game. Players must solve physical challenges by opening portals to maneuver objects, and themselves, through the enigmatic Aperture Science Laboratories.
Yes, this is a very first Portal map i made, and it's made with po_edit. (Instructions in description)
Well, nicely done I can say. Still has lots of bugs (po_edit v4 is already out) as you were using v3 or even earlier version of editor. Giving you 5/10:
8/10 for difficulty;
5/10 bugs n stuff;
1/10 made with old version of po_edit.
OMG V4 IS OUT or you mean v3