Ten Years On: Portal 2 | bit-tech.net
Review: Portal 2 Marries Indie Design, Blockbuster Budget | WIRED
Portal 2: Nosalgia Demo Gameplay video - Mod DB
Everything You Need To Know About Portal 2 - Game Informer
Portal 2 - Wikipedia
Portal 2' game teleports to the classroom
Portal 2 (Video Game 2011) - IMDb
Co-Optimus - News - Portal 2 Co-op Gameplay Basics
Best games like Portal and Portal 2 for mind-bending puzzles | GamesRadar+
Portal 2 - Full Co-op Trailer - YouTube
Portal 2 Co-Op Hands-On - GameSpot
Portal 2 Review - Gamereactor
10 years of 'Portal 2': How Valve redefined video game secrets
Designing a Narrative Experience (Inspired by Portal 2) – PRINT Magazine
Portal 2 - IGN
Portal 2 - PlayStation 3 | PlayStation 3 | GameStop
Portal 2 | WSGF
Portal 2 – exclusive early preview | Games | The Guardian
Portal 2 In Motion adds three mechanics, subtracts one plot (review) | VentureBeat
Portal 2 – review | Games | The Guardian
Portal 2 on Steam
Amazon.com: Portal 2 - Xbox 360 : Video Games
