After beating a game I'm still in love with, I...

[HoloDust]

If game offers sufficiently different experiences, depending on the choices made, and if I liked it a lot, I tend to play it right away again...if they are of reasonable length - which is actually how I like games to be, quite varied and shorter playthroughs, instead of one long saga that offers very little of fundamental differences in subsequent runs.

Of course, these requirements don't apply to mostly "mechanical" games - I can play something like Galaga any time of the day.