Instructions
Collect star coins in each level. You can spend your star coins in the castle of World 1 to watch videos that show you how to find secrets and make your way through tricky levels.
Take advantage of the super guide. If you die eight times in a level you have the option of letting the game pass you through the stage. Jump up to hit the green block that appears and Luigi will show up to run through the level.
Stock up on power-ups. You can earn extra power-ups in the Toad houses scattered across the worlds as well as by defeating Hammer Bros. and other enemies that appear on the map. Press the "1" button to access your power-up supply while on the map screen and press "2" to use one.
Beat Bowser in the final castle by either shooting 30 fireballs at him or running under him quickly when he jumps high in the air. This will trigger the bridge to collapse and Bowser to fall into a pit. He returns in much larger form. The next part of this battle requires you to dodge Bowser's fireballs and let them hit the walls behind you to open up paths. You must also jump from platform to platform to keep from falling in the lava. Grab the Propeller Mushroom power-up to help with this task and make your way to a switch below Princess Peach's cage. This will cause Bowser to fall a final time.