I just finished Portal 2's single player story, and man was that fun. The ending, through the two songs and brief little bit by a certain now favorite video game character just made me smile. Then, it was time for myself, and my younger brother to break our way into the Co-Op mode. My little brother, who had watched me play the full single player game (and often realizing the answer to a puzzle before I would) was a very good partner. Both of us took on the 'gosh dang it, listen to me and do as I say!' role pretty evenly, and that was just... great to have with my bro, especially since I'll be moving out of my parents house in another month.
Portal 2 Co-Op and How cooperative play can be fun
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