Does everyone has 1 game that we cannot let it go?

I mean for example "Trickster", 2D MMORPG.

I played it first time almost 10 years ago, I quited, game closed.
Anyways, there ware someprivate servers running, I played it again then quited (4-5 times with official server and private).

Back and forth.

Now I'm playing it again and still like it tho :D