All 6 Portal challenge levels completed in the Least Portals challenge with gold medals.
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Jetsetlemming
The Least Portals challenge for Chamber 13, completed with 4 portals. It's possibl...
Chamber 14's Least Portals challenge, completed with 2 portals. This is, without a...
Portal's Chamber 15, in the Least Portals challenge, done with 13 Portals. I had t...
Chamber 16, Least Portals challenge, done in 2 portals. Yeah, I did this one in tw...
Chamber 17 (the Companion Cube level) in Challenge Mode, for "Least Portals". Comp...
Chamber 18, Least Portal challenge, completed in 16 portals. It's probably possibl...