Blast Away the Wall
From the Super Mario Wiki, the Mario encyclopedia
The Power Star is hidden inside the terrain, specifically the corner of the wall next to the rotating bridge and the sleeping Piranha Plant. The Star can be accessed only if the wall is destroyed, and the wall can be destroyed only by using the cannon. The player must use the cannon to launch themselves to the wall, causing it to crumble and release the Star. In Super Mario 64 DS, a short animation shows the Power Star emerging from the wall. After that, the player can follow the path up and easily collect the Power Star. The wall to the left of the one containing the Star is similarly destructible, though nothing is inside it.
It should also be noted that in Super Mario 64, after hitting one of the destructible walls, Mario will lose one wedge of health. He may also lose an additional two wedges of health if his fall is too high. In Super Mario 64 DS, no wedges of health are lost after the player hits the wall.
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