Trapped in a brick
As any character go to Hazy Maze Cave and get to the toxic maze. Go to the brick but don't punch it. Stand on top of it and go to the corner. Press 'x' to get to first person view and make your camera rotate so you can see through the wall. Press 'x' agan to get back to normal view and you should fall into the brick(this takes a few tries). If you are Mario, Luigi or Wario I think you can punch the brick from the inside. I don't know what the point of this is (probably just for fun). I also think there are other places it is possible to do this.
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