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. Wii) - Super Mario Wiki, the Mario encyclopedia

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

World 4-1 (Puzzle & Dragons: Super Mario Bros. Edition) - Super Mario Wiki, the Mario encyclopedia

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

World 8-4 (Super Mario Bros.: The Lost Levels) - Super Mario Wiki, the Mario encyclopedia

Super Mario Bros. 4 Level I: World 1-1 by stephen718 on DeviantArt

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

World 4-2 (Super Mario Bros. 3) - Super Mario Wiki, the Mario encyclopedia

World 8-3 (New Super Mario Bros.), MarioWiki

World 4-2 (New Super Mario Bros.) - Super Mario Wiki, the Mario encyclopedia

World 3-4 (Super Mario Bros. 3) - Super Mario Wiki, the Mario encyclopedia

Invincible Mario, MarioWiki