The co-op campaign is the best puzzle design I have seen in years. My partner and I yelled at each other exactly twice and laughed the rest of the way.

Finished the single player again after five years. It is somehow tighter than I remembered. A two hour game stretched into eight perfect ones.

If you are stuck on the light bridge puzzles: look up, the answer is almost always on the ceiling.

GlaDOS lines still land on a third playthrough. The writing team never missed.

Steam Trading Cards have been announced for Portal 2. List of Portal 2 Trading Cards.ChellDestructionFinaleGlaDOSIntroThe LabMannequinUndergroundUpon unlocking all the trading cards you may craft them toghether to unlock some a badge. Cleverly titled, I'm a potato…