My top 10 Atari 8bit games.
As for the games that I have finished. Let me think.
Ultima 1 I finished in 8 days. I can't remember doing anything else in those 8 days besides working and playing the game.
My proudest game finish is probably the Halley Project. Sending away for the special Starbird mission. And finding out about the secret mission. It was also rather educational about the solar system.
There are probably others but none worth mentioning. I never did finish the hitchhikers guide to the galaxy.
In 2002 I finally did finish a game of Star Raiders in normal mode :) WooHoo