Now this covers playing the games single-player multiple times, to even playing its multi-player long past it's launch date. Now, for me, this happens to be mostly single-player... I've probably beat Half-life 2 a good 6 times over. Then up next would be COD4 with about 3 play throughs. Every time these games still feel fun even though nothing has changed (except for knowing a few more secrets now and then.) What games have you played frequently or for long periods of time, and do you even know why? Because my only explanation for playing those over is: They were fun, though I can't really describe it.