World 8-1 (Super Mario Bros.) - Super Mario Wiki, the Mario

World 8-1 is the first level of World 8 in Super Mario Bros. and the twenty-ninth level in said game. It is the longest level in the game. In VS. Super Mario Bros., this is the only level that has a higher time limit than its original version.

VS. Super Mario Bros. - Super Mario Wiki, the Mario encyclopedia

Super Mario Bros. 3/World 7 — StrategyWiki

Luigi, MarioWiki

World 8 (Super Mario Bros.), MarioWiki

Walkthrough - New Super Mario Wii Guide - IGN

World 8-1 (Super Mario Bros.: The Lost Levels) - Super Mario Wiki, the Mario encyclopedia

World 8-1 (Super Mario Maker for Nintendo 3DS) - Super Mario Wiki, the Mario encyclopedia

World 1-6 (Super Mario Bros. 3) - Super Mario Wiki, the Mario encyclopedia

Super Mario Bros./World 8 — StrategyWiki

Warp Zone - Super Mario Wiki, the Mario encyclopedia

Super Mario, List of Deaths Wiki

Mario Wiki