The most addictive game I have ever played was Civilization V: brave New World. I have never, in my entire life, played a strategy game as good as this game. This game just allows you to feel ultimate power and to live history, the history we all studied but never got to live, through the eyes of famous leaders. This game allows you to establish the basics for a successful nation from the scratch, build wonders, create cities and raze other players' cities, advance in technologies and time, defend your empire against enemies, make allies and enemies, establish trade routes and plant the seed of your civilization's culture that would soon grow and produce for you great artists, musicians, writers and engineers. Every time I play a game of Civ, I loose track of time and 5 hours would pass by like 5 minutes, but I can never stop playing easily. This game is just very fun and challenging to play that it is very addictive!