Half-Life is a science fiction first-person shooter video game developed by Valve, released in 1998. If you haven't played this game then something is really wrong with you, still ranked in the top 20 games of all-time lists of many websites, Half-life revolutionized the FPS genre for the generations to come. But on this post I would like to ask people which Half-life expansions (which were also very good games themselves) they liked the most.