GameLengths - Average Play Times for Portal 2 (single player campaign)
Portal 2 Chapter 3: The Return Walkthrough (PC PS3 XBOX360 MAC)
How long is Portal? | HowLongToBeat
Portal 2 Walkthrough / Chapter 9 - Part 3: Final Level 2 of 2 - Howcast
Portal 2 on Steam
Portal 2 PC Review | TweakTown
Portal: Reloaded Chamber 10 Walkthrough Guide – Guide Fall
Portal 2 Walkthrough Chapter 4
How long is Portal 2? | HowLongToBeat
How long is Portal 2: Sixense Perceptual Pack? | HowLongToBeat
how long does it take to beat portal - Lisbdnet.com
Portal 2 review | PC Gamer
I was bored so i decided to time myself on how long it would take me to beat portal 2, credits ended at 2:34:14, nothing amazing but i thought i would post
50% Of Portal 2 Players On Steam Haven't Finished The Game
Portal 2 on Steam
Portal 2 Chapter 3: The Return Walkthrough (PC PS3 XBOX360 MAC)
50% Of Portal 2 Players On Steam Haven't Finished The Game
Review: Portal 2 – Destructoid
The Escape - Chapter 5 - The Escape - Single Player Walkthrough | Portal 2 | Gamer Guides®
Portal 2 Walkthrough Chapter 6
Portal Reloaded: How to beat the Chamber 15 puzzle - Hot Movies News
how long does it take to beat portal - Lisbdnet.com
Portal 2 Walkthrough Chapter 8
