Play as Luigi in single player mode
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!
Contributed By: akzion.
Secret Challenge Mode
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.
Contributed By: modernfiend.
Alternate Way to Store Mega Mushrooms
If you want to store a Mega Mushroom in your inventory like you do with a multitude of other items, simply grab the Mega Mushroom and hit a ? Block at the same time. (This is easiest to do in World 1-1.) You'll then have the Mega Mushroom stored, even though you technically had enough room to "grow".
Contributed By: KeyBlade999.
To save your game anywhere on the map screen, beat the final castle in World 8. When you restart, you will have a star next to your save and you'll get the "Save" option added to your menu in the map screen.
Unlockable How to Unlock Save Anywhere Beat the game
Contributed By: NeoKamek.
Special BG Patterns & Unlimited Toad House Items
Unlockable How to Unlock Special BG Patterns Beat the game once. Unlimited Toad-House Items Clear Every Level, including lettered bonus levels.
Contributed By: GCNMario.
Unlockable How to Unlock World 4 Defeat the boss in the last castle of World 2 as Mini Mario World 7 Defeat the boss in the last castle of World 5 as Mini Mario
Contributed By: SP5889.
Mushroom houses at start of each world
The mushroom houses at the start of each world (the point with an arrow at the start) differ determining on the time you get on a stage.
If you get x11, x22, x33 on the timer, a Red Mushroom house appears, which generates items.
If you get x44, x55, x66 on the timer, a Green Mushroom house appears, which is a 1up minigame.
If you get x77, x88, x99 on the timer, a Orange Mushroom house appears, which lets you gain a Mega Mushroom into your inventory, thus overriding anything in it.
Contributed By: Kirby102.
Original Mario Bros theme and fireworks
If you beat a level with a time left of x11, x22, x33, x44 etc you get fireworks and the original mario level completion song will play.
Contributed By: hyperkikox.
Extra Lives at Flagpoles
As you may know, jumping onto the flagpole at the stage's end will net you some points (up to 8000). In this game, if you somehow manage to jump high enough and land on the very top of the flagpole, you will automatically receive a 1-Up.
Warp Zone Cannons
In some worlds, there are cannons you can access (usually through taking secret exits). When you enter the cannon area, there will be a large cannon in the area, and a world number written below it. If you want to warp, simply drop into the cannon and off you go! Here is a list of the known warp zones thus far:
World 5 Warp #1: Take the secret exit from the World 1 Tower.
World 5 Warp #2: Take the secret exit from Stage 2-A.
World 6 Warp: Take the secret exit from the World 3 Ghost House.
World 7 Warp: Take the secret exit from the World 4 Ghost House.
World 8 Warp: Take the secret exit from the World 5 Ghost House.
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