World 6-4

World 6-4 may refer to:
 * World 6-4 in Super Mario Bros..
 * World 6-4 in Super Mario Bros.: The Lost Levels.
 * World 6-4 in Super Mario Bros. 3.
 * Chocolate Island 4, World 6-4 in Super Mario World.
 * Tap-Tap The Red Nose's Fort, World 6-4 in Super Mario World 2: Yoshi's Island.
 * World 6-4 in New Super Mario Bros..
 * World 6-4 in New Super Mario Bros. Wii.
 * World 6-4 in Super Mario 3D Land.
 * World 6-4 in New Super Mario Bros. 2.
 * Light Blocks, Dark Tower, World 6-4 in New Super Mario Bros. U.
 * Light-Up-Lift Tower, World 6-4 in New Super Luigi U.
 * Deep Jungle Drift, World 6-4 in Super Mario 3D World.
 * Spray Day Mayday, World 6-4 in Yoshi's New Island.
 * World 6-4 in Puzzle & Dragons: Super Mario Bros. Edition.
 * Knot-Wing the Koopa's Sky Fort, World 6-4 in Yoshi's Woolly World.