On top of those puzzles is a layer of Valve’s unmistakable humour, and GLaDOS (remember her?) is once again the star. It makes communication vital, and each puzzle all-the-more rewarding to solve. If one player jumps a split second early, or activates a button too late, the whole plan falls apart. Not only will you and a friend, who each control a loveable robot, have to put your heads together to figure out how to finish a test chamber, but you’ll often have to time your movements and actions just right. The co-op campaign is a noticeable jump in difficulty from the already fiendish original. If you have a desktop or laptop that can run it (and most can), and a friend that can do the same, then you’re in for one of the best co-op experiences of your life. Right now, you can only play Portal 2 on PC, but don’t hold that against it. If it were playable on current-gen consoles, Portal 2 would likely top this list.
