- level 18 help
- chamber 19 help
- Stuck on Level 19 (Minor Spoilers)
- Chamber 18: Advanced - Can anyone help? (spoilers)
- Chamber 19 ending help (may be spoiler present)
- chamber 19 turret room
- Need help pls, im stuck ?? (spoilers??)
- ChallengeRoom 17
- Stuck in 19
- How do you beat GLaDOS?
- Stuck on the last bit
- Any tips on chamber 15?
- Stuck on chamber 18
- level 19, above the fire
- STUCK! Please help! (spoilers)
- testchmb_a_13
- need help, the part after the thing with rockets (screenshot inside)
- stuck in chamber 19 (room with a lot of pipes)
- Help in Advanced Chamber 15.
- Least Portals Challenge Guide 13 and 14
- Least Portals Challenge Guide: Chamber 15
- Stuck on escaping (after chamber 19) Screenshots included
- Level 19 again - i'm stuck here!!!
- Challenge maps - Chamber 17
- Advanced Chamber 16
- stuck on lvl 31
- stuck lvl 32
- T19 - thing that fires rockets?!
- Stuck in room with GlaDos
- Stuck in a huge room with horizontal masher/piston things...
- Camera Shy Achivement
- Confused on if I even finished the game or not...
- Level 18 Advanced
- GLaDOS doesn't speak
- Lvl 19 - Stuck
- Anyone got a strategy for #17 Least Steps????
- Help with Last Level
- Last level (19) - need help
- Chamber 18 - Need help!
- Level 19 strcuk.. almost end i think
- Stuck on Level 19? Look here!
- Escape Help! Screen Shots
- Stuck in Lv 19 (picture)
- Camera shy
- Need halp!
- all these videos
- Halflife2.net Portal Walkthru Videos - by The Brick
- Help!!!!
- White screen loading portal
- Portal startup
- Horrible framerate at main menu in portal
- finishing up on half life 2
- HELP! I think it might be a MAJOR glitch...>.<
- Portal Level 11 Help
- *amazing* Portal speedrun - obviously BIG spoilers
- installation problems
- Installation without Internet
- Installation