Many Tanooki Suits
In World 5 (Cloud World), the first available mushroom house has a Tanooki Suit. Get it and beat levels until you get to the cloud part of the world by beating the spiral tower. The game offers to save your game. Save it, then get game over. When you continue, you keep the Tanooki Suit you got at the mushroom house, and the mushroom house has returned! All of the other levels remain defeated as well, though the spiral tower remains standing, so you cna beat it and save your game, get game over, and get another Tanooki Suit each time! The suits make good replacements for leaves, mushrooms, and useless items (like music boxes) in your item list. Glitch only works for World 5 due to the ability to beat the spiral tower as many times as you want and save after each time.
Behind-The-Scenes
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.
Special World Endings
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.
Unlock World Selection Screen
Beat the game clearing every single level (90 in total). Once Bowser is defeated, save and you will be brought to a World Selection screen where you can jump to any of the 8 worlds. All locked doors will have been unlocked and you can freely visit any stage/bonus stage/castle/etc.
Warp Flutes
Warp Flute 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 duck, and after a while you will fall behind it. Stay behind the backround while going all the way to the end of the level.
Warp Flute 2: In world one's fortress, go to the area 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 should be a hidden doorway.
Warp Flute 3: In world two, go to the top right corner of the map. Use a hammer to break a boulder up there, and then continue to the right to find a hammer brother. Beat him to get the flute.
Special Suit Trick
Go to a mushroom house and pick a chest. If it contains a suit, get a game over. Now select continue. The levels you have beaten will not be reset, only the mushroom houses and the slot machine games. After continuing, go back to the same mushroom house where you've received the suit. No matter what chest you pick, you will always find a copy of the same suit. Repeat this trick to get as many suits as you want.
Underwater Shortcut
There is an easy way to beat the ship level (after the tank level) in the final world. Just swim under below the ships. Keep pressing A so you won't sink too deep and die.
Warp to World 8
Once you've got two warp whistles you can use them both to instantly end up in World 8.
Lots Of Lives
First go to level 1-2. Go about half-way through the level until there is a pirana plat by some coins in the air. Below the plat there are two bricks, smah the one with the P block and smash it. While the coins are bricks, run up and go to the right of the pirana plant. Jump and a 1-Up mushroom will pop up. Quickly grab the mushroom and go into the tunnel. When you come out of the tunnel, do this process over and over until time runs out and you will have a bunch of lives.
Secret Room In World 8-2
To find the secret room in world 8-2, go to the first sinking sand, go in it and let your self sink. When you at the bottom you will see your self in a secret room with two pipes. Both pipes lead to different rooms. After you get out of one of the pipes you just went in, you will end up near the end of the level.
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