I've no idea what brought this memory up, but back in grad school we found the XPilot game and became addicted. You could play people all over the world, any time of the day. We hosted our own, local, games, and enjoyed seeing who would join (sometimes we got players from Germany).
The XPilot craze lasted a few months, but many of us first-year grad students lost days to playing this. I'm glad to see it is still an active game, though I doubt I'll play it again.