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.

Super Mario Bros., MarioWiki

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

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

World 4-1 (Super Mario Bros. 2) - Super Mario Wiki, the Mario encyclopedia

World Mushroom (New Super Mario Bros. 2), MarioWiki

World 4-1 (New Super Mario Bros.), MarioWiki

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

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

Invincible Mario, MarioWiki

World 2-1 (New Super Mario Bros.) - Super Mario Wiki, the Mario encyclopedia

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