The Original Super Mario Bros on NES

Hi All! I was just thinking about some of the old video games I've played, and, a question struck me. Did anybody here ever beat the original Mario Bros for NES?

I tried, but never did it. Actually, I never really made it too far into that game.

I was also wondering if anyone had a total level count for that game. I know on BBT, Sheldon says it was the happiest 600 hours of his childhood.