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.

Mario Wiki

New Super Mario Bros., MarioWiki

Super Mario Bros.: The Lost Levels (Video Game) - TV Tropes

World 8-Castle - Super Mario Wiki, the Mario encyclopedia

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

World 1-2 (Super Mario Bros.), MarioWiki

1-Up Mushroom - Super Mario Wiki, the Mario encyclopedia

Super Mario Wiki (@SMWikiOfficial) / X

The Adventures of Super Mario Bros. 3 - Wikipedia