All right on world 4-level ghost house if you have a blue shell and spin into the wall with the stripped spinner everything on the left side of the wall will freeze. ( Even the coins will stop spinning).

How do I get to world 4 and 7

Ok theese are all the cheats I know
Luigi:to be Luigi... At the screen where you choose a file hold L+R and press A you should be Luigi.

Easy 1 ups:to get easy 1 ups go to world 4 go to the level before the castle (not bowsers castle) and at the end youll see a turtle on the stairs. Before it goes on the big block...jump on the end of the turtle and DONT TOUCH ANY BUTTONS then wait a couple minutes you should have 99 lives.

Easy killing bowser and koopa kid on the last level:get a big mushroom save it till you fight bowser and koopa kid use it run them over... And they should both fall in the lava. Three stars at the title: one star:beat the game once two stars:beat all the level (even letter levels) three stars: get all the star coins.

To get the following 'Save File' Stars on your file meet the corresponding requirements

1st Star:
Beat the game once.

2nd Star:
Beat every level in the game.

3rd Star:
Collect and spend every Star coin.

Hold the L and R buttons at the 'Select a File' screen and select one of your saved game files with the A button to play the game as Luigi instead of Mario.

To get the world 4 and seven you need to beat the final boss with mini mario

To make Luigi a playable character - Go to the select file screen highlight a file then hold L+R and press A. There we go. ^_^

I have found a way to kill the nasty and annoying boo's. When you have the blue shell make sure you have a run up, starting spinning and then run into them, that is how to kill boo's. It is the only way that I have found so far.

Hope this helps =)

Press l and are while selecting a file and you will be luigi.

Well to unlock these worlds you have to beat world 2 on small mode this means that you have to beat bowsers castle on world four on really small mode(Blue Mushroom).You also beat World 5 with the same thing.it may be REALLY HARD!!!

There are 5 cannons and I am going to tell you were they all are.
1 world cannon to world 5:In small bowser :have a shell on you were the scond coin or third the one with the door then go through the right side not the doorthen use the shell to break the blocks and the go through the pipe then you shoul land outside of the castle and go to the flag

Moon Walk
This is my all-time favourite cheat
On level 4-2 at he begining you have to jump two things. One is big, the other is narrow. On the narrow one jump and hold down. (If you did this right you should be under some bricks.) Let go of down and keep holding left. Mario then will moon walk.
Submitted by Mariochamp

This isn't so much a cheat so much as a fact of how to get luigi in story mode it also show's how to get him in the back ground at the end of the game what you do is go to choose game, then hit L and R at the same time, then hit A to select file. And then presto you have luigi

About the 99 lives cheat at the end of level 1 world 1 when I jump on the koopa at the end of the level (the steps) all that happens is mario jumps on it then bounces of it the lands back on it (when the koopa is in it's shell) it bounces of the step and goes into the hole before the box's where you find the koopa! And then I don't press any buttons for a while nothing happens (i don't press anything for about 4 1/2 mins ) can someone help me please!

Be big to knock the flag over and gain 8000 points

Hint:Its best to be fire Mario/Luigi at the end of this level.

By the end of world 1-1 you'll see a red Koopa, grab it's shell and bring
It to one step of the steps by the finish pole and keep hold of it till
It shakes and gets out of it's shell, when it does jump on him and he'll
Go into his shell, after that don't touch a button till you get 99 1ups.

Don't move when Mario/Luigi is jumping on the Koopa shell till you get
99 1ups.

Go to the world 3 cannon and instead of going in the cannon keep on going and you will find a free lotto box every time you go in to the cannon level there will be a new lotto box

While paused on the map, press L R L R X X Y Y to enter the secret Challenge mode. You will now be unable to go back to an area that has scrolled off the screen while playing a level. This cheat only works after you finish the game.

At the "select a file" screen, keep pressed L and R buttons and choose one of your saved game files with the A button.
Now you'll play in the game as Luigi instead of Mario!

First Star: Complete the game once.
Second Star: Complete the whole game(Including the Letter Levels).
Third Star: Complete the whole game with all the stars from every level.

P.S: If you want to save this you MUST go to PAUSE MENU, go to Save Game and press YES because if you press NO it won't save and you will have to start from your previous save area.

PLEASE enjoy this cheat and please rate this.
I hope you all find this very useful.

I am still stuck on W3-3 in the dungeon with the ghosts.I can'r get past the second screen.I go up the stairs on the right and then jump on a ?Then what do I do ?

I am stuck on W3-3,the second screen.This is where he is in the dungeon with the flying ghosts.I went through 2 doors(I threw fireballs at the ghost but nothing happened and th other door where it looked like pumpkins,and smashed them).Now I can't do anything else.Help!

I am in w3-3 and on the second screen.Marion is in a dungeon with white ghosts.I am stuck here.Please help!

I am really stuck!I am on World 3-3,the second screen.Mario is in a dungeon with flying ghosts.I cannot get past the first screen in this room.I have tried 2 doors.I jumped on the question mark but I can't seem to find an end to this one.(W3-)Help!THis is driving me crazy

If you have beaten the game, then you can use this code. First, you need to be on the map screen. Then you need to pause the game. While it is paused, press the following buttons in this order: L,R,L,R,X,X,Y,Y. It will show a message telling you that you did it right.

What this code does: When you're playing a level, the screen can't mscroll backwards. There will be an arrou sign telling you if the level uses this function. This makes the game seem even more like the orignal SMB on the NES!

P.S.: To disable the code, just put in the cheat again!

To play Luigi in New Super Mario Brother, you need to go on to select file and hold L and R and select your file. If you have done it right he should say,
"It's me, Luigi!"
Hope I helped!

Ok this cheat just gives you coins and lots of goombas so listen up...

Step 1: Go to world 1
Step 2: Go to the first level
Step 3: Get a huge mushroom!
Step 4: this might waste your hugeness time, but keep ground pounding the ground and a whole bunch of goombas and/or coins will fall out of the sky!!

PS: I don't know if this only works for the first level or not so you can try it on any other levels I havent tried it...

Thanks!!
*~*ixxlikexxapplesxx*~*

On the credit role at the end of the game. Touch the bottom screen with your pen , it will make noises. Different noises for every letter!!!