Warp Whistle 1
In World One, Level Three, go near the end of the level until you see a white block. Step onto this white block and press down Hold it for a while you will fall behind it. Stay behind the background while going all the way to the end of the level and you will get a Warp Whistle that will take you to a faraway land.
(Thanks to Hellsangels100@aol.com)

Warp Whistle 2
In the Fortress in World One, go to where the ceiling is open (it is just before a door with a skeleton koopa). Make sure you have a Raccoon Leaf. Fly up above the screen and then move to the end at the right. There will be a hidden doorway and in there, another Warp Whistle.
(Thanks to Hellsangels100@aol.com)

Warp Whistle 3
In World Two, go to the top right corner of the map. Use a hammer to break a boulder there, and then continue to the right to find a Hammer Brother. Defeat him to get the Warp Whistle.
(Thanks to Hellsangels100@aol.com)

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