Portal 2

Portal 2 is a game played by Markiplier and Shodleech.

Game Information
The "Perpetual Testing Initiative" has been expanded to allow you to design co-op puzzles for you and your friends!

Episodes

 * 1) TEAMING UP WITH SHODLEECH
 * 2) GREAT SUCCESS!!
 * 3) NOW YOU'RE THINKING WITH PORTALS...