I played the arcade version a handful of times as a kid. On the Vectrex, I could play it indefinitely. Since playing it in MAME, I haven't for the life of me passed the tunnel section. I can get all the way there on one ship - I did just now - but no matter what stick I use, I alwasy bite it at that tight jagged spot. Either I try to just move up, wherein I crash into the wall ahead - or, most often, I try to do like I did on the Vectrex and go fast then slow and pull up. INVARIABLY I smash into the ceiling. If not for that part, who knows how long I could play it...