Beating the game...

Hey all,
First post, but a long time lurker. How do you guys know when you have "Beaten the game"? I know, I know, if I have to ask... I was just courius as I play in a airly regular bunch of games and there is one in particular that I seem to just Kill. It's getting to the point that the host is asked on a regular basis if I am attending, if I am then no one shows up.

Have I beat this game?

Thanks in advance.

Ritchie Z