I saw this and thought maybe I would think this one over, and I honestly think that the game I have the most hours in would be Medal of Honor: Allied Assault and the Spearhead expansion. I lost count of how many hours I put into that game, but I do remember days of just playing for 12+ hours straight online. Used to be in the top 5 ranking regularly. Then after that, I have many hours in different RPGs, and here lately I find myself playing so many random games, it is difficult to put in many hours in any one of them. Along with working on my car and friend's cars, helping out with random projects, gaming now, I enjoy it, just not enough time in the day to really get into a game. Games I would like to put in hours with though would include: Star Citizen, Grand Theft Auto 5 when it hits PC, and more that I am currently too tired to think of. Back to Medal of Honor though, I think I likely have thousands of hours into that game...... I played it nearly everyday for some time.