In Gaijin's game BIT.TRIP.BEAT there is a Portal 2 based level. : r/Portal
This Portal 2 Mod Lets You Play Against Yourself | WIRED
Portal 2 Review – Techgage
How long is Portal 2? | HowLongToBeat
The Final Hours of Portal 2 | Half-Life Wiki | Fandom
Binary Adders in Portal 2 : r/Portal
tevis thompson
PORTAL 2 - Full Game Walkthrough - YouTube
Last year my 7-year-old son beat his first real video game, Portal 2. In honor of his accomplishment, I painted him a picture of Wheatley. This now hangs in his bedroom. :
Portal 2 Free 'Peer Review' DLC Now Available on XBL | XboxAchievements.com