World 6-3, a Ghost House, is the thirtieth level of Super Mario 3D Land.
This Ghost house begins in a small diamond-shaped room featuring three paintings. The moving platform in this room will carry Mario to each of these paintings; each of these paintings contains a secret path into three mini-levels. The first of which is a large paino, the second is a block, and the third is a library. The library is the only one of these rooms Mario must enter to complete the level, the other two only lead to collectibles.
The piano area, as the name suggests, is an overzealous piano with coins and music blocks on it. There are also a few Boos here the blend in with the piano as well. The second area, the block, is a 3D level that sports several metal blocks as well as several teleportation blocks. The top-left block is the only block that leads back into the center room. In the library, Mario finds several boos and coins. The left-most bookcase moves back and forth during Mario's time in the room.
The library area continues until the end of the level. This area features several book-like platforms and traps. Across the second tight-rope in the area, Mario will find the door to the Flagpole.
Enemies that appeared in World 6-3:
- Star Medal 1: The first Star Medal is moving horizontally in the middle of the piano area.
- Star Medal 2: The second Star Medal spins around the large cube of blocks in the block area.
- Star Medal 3: The third Star Medal, found in the library area, is obtainable by jumping in the bottom area of the second floor of the area.