This is an improvement to my previous SMB1 warp run. It is 22 frames faster, due to much better luck manipulation combined with a new acceleration trick in 8-2, which helped bust the 21-frame rule, and 1 frame saved in the very first section in 8-4, using the same trick used in this movie.

Thanks to HappyLee, andrewg and adelikat, as their movies prove the 8-2 improvement feasible, though it's extremely hard without the fireball upgrade.

mmbossman: Accepting as an improvement to... you know the rest.