What Are The BEST And WORST First Levels In Super Mario Bros?

This list is fact checked and officiated by uncles that work at Nintendo all over the world! Intro music: https://www.youtube.com/watch?v=77PW1gc4G2Q&t=0s Outro music by Alf at the end of their playlist: https://youtu.be/A27sq-P6Yxs?si=x5IKvMoB-RFcxKYP