World 4-1 (Super Mario Bros.) - Super Mario Wiki, the Mario encyclopedia

World 4-1 is the first level of World 4 in Super Mario Bros. and the thirteenth level overall in said game. This level introduces the Lakitu and Spiny enemies in the series.

World 4-1 (New Super Mario Bros.) - Super Mario Wiki, the Mario encyclopedia

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

World 4-1 (Super Mario Bros.) - Super Mario Wiki, the Mario encyclopedia

World 4-3 (Super Mario Bros.), MarioWiki

World 1-4 (Super Mario Bros.: The Lost Levels) - Super Mario Wiki, the Mario encyclopedia

Super Mario Advance 4: Super Mario Bros. 3 - Super Mario Wiki, the Mario encyclopedia

World 1-4 (Super Mario Maker for Nintendo 3DS) - Super Mario Wiki, the Mario encyclopedia

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

World 4-4 (New Super Mario Bros.) - Super Mario Wiki, the Mario encyclopedia