Get a p wing or racoon mario and fly in the world 1 castle and fly above the top of the screen past the door. Press the up button and you will see a treasure chest. Open it, and a warp whistle will be there.
It's a good idea to complete every level in each world because once you have destroyed BOWSER in he's castle in world 8 you have to beat those levels you skipped after you have completed bowser's castle!
When you have done that you will be able to play levels over and over again but you can still get stuff mushroom houses, you can also play against the hammer and boomarang throwing guys and you can play the castles including bowser's again!
You know the box at the end of the level?the one with all the items flashing rapidly fast.well,i know how to get the star 96% of the time on that.before you hit the box and get mushroom or whatever you get,run all the way until the letter "P" is liting up and flashing at the bottom of the screen.and while it is still flashing,when you get to the box,jump up to hit the box,make sure the "p" is still flashing & liting up.and when you hit it if the "P" is is still lighting and flashing you will most likely get the star.here is how many lives 3 stars or 3 mushrooms get you. 3 stars=5 ,1-ups,and 3 mushrooms I think is.....2 or 3, 1-ups.hope I helped! :P
Go to level 3 in world 1 and when you pass the second turtle that tries to hit you with a boomarang you should see a red turtle kill it and hold down for about 3 to 6 seconds and it should take you behide everthing and finish the level don't jump when you are behind something.
Because you wont be behind anything anymore but jump over the enimes when you are not behind anything and when you finish the level you will be behind the black spot and toad will come up and let you open the box "you have to press B to open the box"and then use the whistle and you have to go to the last tube it will show a 4 above to tube.
1. When you play the game and you reach an airship level (perferred to be called Bowser's castle) and you lose the first time, the airship will fly somewhere in the world. When you go to the castle nothing wIll happen.
2. To get to Boom-boom directly by entering the third door then repeatedly tapping up on the control stick. For the second code I got it from the Nintendo power magazine so trust the publisher.
Level Select Defeat all 90 levels in a game to be able to play any level repeatedly. You will also have access to Spade games, Mushroom houses, Hammer brother fights and the Fortresses.
World Select Beat the game with or without the use of warp whistles to access any world you want.
Hint: Special Suit Cheat At a mushroom house select a chest and If it contains a suit get a game over. Then choose continue. Those levels which you have already defeated will not be re-set (only Slot machine games and the Mushroom houses).
When you continue, go back to the same mushroom house were you got the suit and you will find that whatever chest you choose there will always be a copy of the same suit. This cheat can be repeated to gain more suits.