This time around, i am wondering... which game have you played over and over and over and over again? Which games have you really enjoyed so much that you've played them again and again?
Mine would be Onimusha 2 (which was largely made by the same team that did Devil May Cry).
I absolutely love Onimusha 2 out of all 4 games in the series (or 6 if you include Blade Warriors and the Tactics version on the GBA). I think it is a gorgeous game with beautiful music and a real sense of atmosphere. I don't get bored of it and will play it many more times. I think so far I have played and beaten it about 25 times since I bought it in 2003.
Edit: After reading some Posts below, I would also like to add: Number of hours you put into a game also counts. Example: Number of hours you put into a Final Fantasy game or another RPG
Which games have you played many, many times and truly loved?