Super Mario Advance 4: Super Mario Bros. 3 Cheats

Defeat the Koopaling at the end of an Airship (Worlds 1-7) while wearing either the Frog, Tanooki, or Hammer Bros. suit and receive a special message from the King.

In most levels, there are multi-colored blocks held up by screws. With the white ones, you can drop behind the scenes to escape enemies or find secret exits by holding down on the d-pad for 5 seconds. In World 1-3 towards the end of the level, drop behind from on top the white block and run behind the black curtain. You will uncover a hidden mushroom house which contains a warp whistle.