More:Super Mario 64 DS: Whomp's Fortress

From GameWinners

Contents 1 Star 2 Teleportation 3 Blast away the wall

Star

Use the following steps to get the sixth Star in course 2. Go into the cannon by the water. Aim the cannon by the far, thin wall. Hit the corner and the wall will break. Soon after that, a Star appears.
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Teleportation

Get to the first Thomp then go in the corner. You will be teleported to the pole near the end of the level.

Blast away the wall

Go to the canon located near the water. Go in, and if you move the canon to the correct place, you will see two walls. Aim the canon to one wall. Aim it to the tip/corner of the wall. When you press A, you will see that you have chipped a piece of the wall. Chip the other wall in the same place and a Star will appear.