Secret area in world2
Make sure you have a hammer (not hammer suit) and go to the top left hand corner of the screen of world 2,
Where the mound of dirt is, use the hammer.
This will reveal a secret area with a red version of the hammer bros. Beat them to obtain a warp whistle.
If you need more help, we've got more Super Mario Advance 4: Super Mario Bros. 3 cheats and also check out all of the answers for this game
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