World 9-4

World 9-4 may refer to:
 * World 9-4 in New Super Mario Bros. Wii.
 * Hammerswing Caverns, World 9-4 of New Super Mario Bros. U.
 * Hammerswing Hangout, World 9-4 of New Super Luigi U.
 * Creepy-Crawly Bowser Tower, World 9-4 in Super Mario Maker.
 * World 9-4 in ''Super Mario Maker for Nintendo 3DS.