World 6-5

World 6-5 is the name of several different levels:
*World 6-5 in Super Mario Bros. 3.
*World 6-5 in New Super Mario Bros..
*World 6-5 in New Super Mario Bros. Wii.
*World 6-5 in Super Mario 3D Land.
*World 6-5 in New Super Mario Bros. 2.
*World 6-5 in Puzzle & Dragons: Super Mario Bros. Edition.