Hints
This is just a few hints mixed together for people who are stuck on specific parts.
--World 4--
Defeat the W2 Boss as Tiny Mario.
--World 7--
Defeat the W5 Boss as Tiny Mario.
--Luigi Joins The Action--
While you are picking, on the main menu, Mario Game, hold are and L at the same time.
--World 2 Cannon--
Go to W2-3. While in the room with the water, go up the tube at the top while in the water. Before the water level drops, press the button hanging down. It will rise further. Go through the tube at the top and straight out. You will find a red flag. Now go to the bonus level, W2-A, and while at the end, don't go through the pipe at the bottom, instead try for the top pipe while spinning and hitting the Paratroopa on the bottom to fly up. Get the red flag, and you have the W2 Cannon that blasts you to W5.
--How To Fight As Tiny Mario--
Double click A on top of enemies.
--How To Beat W6-4--
You know that big pipe blocking your way? Well to get around it go in the pipe in reach next to it when the Piranha Plant isn't visible. The carpets roll so you have to jump!
If you need more help, we've got more New Super Mario Bros cheats and also check out all of the answers for this game
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