I've never seen a video of anyone ever playing "indefinitely" on Tempest, by which I mean more than a handful of levels past 99, though clearly the scores indicate it's been done.
There's nothing on Youtube (one person makes it to level 91 or so). I haven't played in years, but I'm back to where I can get to or past 99 on a good day, but not indefinitely yet.
At one time I held the Atari official high score, but the machine was set to 10K bonus which made it more of a bathroom endurance test than anything! I'd like to take a shot at the TG scores, but don't want to be chasing ghosts (plus you never know I might learn a great secret of Laszlo or similar!).
Is there anything out there?