Super Mario Bros.:The Lost Levels/Any% 8-4 Strategy

This game has a run page on SDA!

DISCLAIMER: This page is referring to the Famicom original release, not any of the remakes.
However many techniques still work in the same or a similiar way in the releases. Almost everything works exactly the same as in the prequel Super Mario Bros., go this page for information on general game mechanics.
See i_o_l's WR video for the general strategy. This only goes into detail on the non-obvious things going on.

Level by level explanations

World 1-1

World 1-2 (Warp to 4-1)

World 4-1

World 4-2

World 4-3

World 4-4

World 5-1

World 5-2 (Warp to 8-1)

World 8-1

World 8-2

World 8-3

World 8-4

RTA WR and TAS comparison