In Lethal Lava Land, at the beginning of the level, turn left and walk across the
platform, jump across to the island in the lava. On a certain place on the island, if you
just stand there, you will be transported underneath the giant eyeball near the center of
the level. (do not try with luigi while invisible because you will keep bouncing on the
lava and probably die, since you go through the platform)

Use any character that's NOT Mario! Get his cap and jump under a ? block, lose the cap,
get the fether and PRESTO!

As you do a long jump hold down R, when you hit the ground press B, you should do another
long jump! You will keep on doing long jumps if you hit B everytime you hit the ground.

When playing the game, pause and then close the DS. When you close it, Mario will say
"Bye-Bye!". Then wher you re-open it , you will he him say "It's-a me, Mario!".

In any level where there is a small wooden post sticking out of the ground, pound it three
times to have 5 coins revealed. This can be very helpful when trying to get extra lives or
a 100-coin star.

With Luigi in Mirror Room, hop into Wario's Painting and Defeat the Giant Ice Bully.

When the hands are revealed in any of the card games that has a record that increases when
you win and decreases when you lose, look at the opponent's hand before it displays who
wins or loses and pause. If you lost the hand hit quit and reenter the game. You'll have
lost however many coins you bet but your record will remain intact.

Beat King Boo in Luigi's Painting on the 3rd Floor of Big Boo's Haunt.

After getting all 150 stars, return to Cool, Cool Mountain and you can race a fatter
version of the penguin.

On the screen that lets you choose either rec room or Adventure touch the stylus on the
characters faces and it will become black and white. You can pull on their faces to move
it around.

Find all the characters and the collect most of the rabbits. Eventually, the more you
collect, white sparkling rabbits will pop up in places with normal rabbits were. Capture
these 8 rabbits and enter the door that is all quiet. Someone will come out one power star
richer.

For this warp, the water level needs to be as low as it can get. Walk around the base of
the level until you find the brick structure that is made of several steps. Stand at the
base of the structure, in the corner between the highest and lowest steps. The game will
warp you to the top of the structure that holds the entrance to the cannon. You can also
warp from the cannon to the other structure.

Go underwater and wait for awhile until you lose one health gauge. Now just press up until
your feet get out. And there you go.