Since we're on Atariage, I'll chime in with a 2600 one I think everyone's forgotten, SPACE INVADERS! Was way more fun and playable than the arcade. Hold down the reset button on power-up for double shot, game variations, etc. Arcade version was an icon but killed you, to death--limited long term appeal for me. 2600 version was played for hours and hours and hours by me and my brother back in the day, truly the first "killer app" and the first home conversion of an arcade game that I can remember, certainly the first one that was really good. The 2600 had few good arcade conversions, period. Anyone remember Donkey Kong and Pac-Man on 2600? Blech!!