28 P-Wings - Complete the game and watch the ending. Now start a new game. You got 28 P-Wings!

Harmless Bowser - Only the top part of Boswer can hurt you. So, it is possible to run through Bowser as small Mario and not get hurt. Or, you could have big Mario duck while Bowser tries to stomp on him. He'll remain unharmed.

Level 1 Fortress - Fly over the top of the level when you find the first door with your raccoon powers, and find a hidden door at the far right on the ceiling. It leads to a warp whistle.

Level 1-3 - Find the white block near the end and crouch on to of it for 5 seconds. Then proceed to the goal, and go behind it. You will find a Mushroom house with a Whistle.

Level 2 Hammer Brother - Get the Hammer from one of the Hammer Brothers here and use it to destroy the rock at the upper right corner of the Level 2 Map. Then engage the hammer brother on the other side. You should get a chest with a Warp Whistle.

Make player 'hide' behind scenery - To ''hide'' behind scenery, simply hold down for a couple seconds while standing on a white block. Then your player can ''hide'' behind scenery for about thirty seconds.

Morph a wandering hammer brother into a treasure ship - To turn a wandering hammer brother (the ones that walk about on the world map) into a white ship full of coins, collect a number of coins that is a multiple of 11. Make the tens digit in your score match the multiple of 11. Stop the timer at the end of the stage that you are playing in on an even number.

One combination would be: 11 coins, 9,310 as your score, and the timer at 104. This only works in worlds 1, 3, 5, and 6.

See a different Thank You letter from the King - Get through an airship and defeat the boss as a frog, Hammer Mario, or Tannooki, and you'll receive a letter from the King that reads a little differently.

To get the N-Spade Card Game - To get the N-Spade card game to appear on the World Map. You must do gain 80,000 points as one player, and successfully beat the stage that you broke the 80,000 points with.

Warp to Level 8 - You could just use the warp whistle at level 7. If you want to go straight to level 8, you must use a Warp Whistle to proceed to the Warp Zone, then use another warp whistle IN THE WARP ZONE. You will be transported to the level 8 pipe at the bottom of the screen.