[SFM] Portal/2: Turrets - Are they possible?
1:34
PotatOS: Is it possible?
1:02
Life of a Core | S2 EP1| Portal Fan Production
0:04
Stalemate Detected
3:03
[SFM] Portal - Rocket Sentries: Are They Possible?
5:33
[SFM] Portal/2: Is GLaDOS Possible?
5:43
[scrapped] wrong floor,assembly cut, abandoned
13:29
All Turret Versions - Portal
4:10