HL2: EP 2

Starting listening to the commentary on Half-Life 2: Episode 2 and its really interesting. The really do a lot of play testing to find out what works and what doesn't. Also, it is interesting to hear a lot of the little things that you normally would never notice. For example, at the beginning of the game a bridge with a train on it collapses consisting of more than 700 different objects in perfect harmony. It is amazing how many little things made it into this game that you would never notice unless told.