Super Mario 64 Cheats :
Secret - Misleading Paintings
there are 2 paintings, or level entrances that blend in with the wall around them.
1 can be foundin the basement of the castle. Turn right from the entrance to "lethal Lava land" and jump into the wall to find yourself in a desert type place.
the other is in the room with the big mirror on the top floor. jump into the wall to the left, to head to a winter level.
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