World 6-3 (Super Mario 3D Land)
From the Super Mario Wiki, the Mario encyclopedia
Mario starts the level in a room with three portraits, one with a piano on it, another one with an Empty Block on it and a last one with a book on it. Mario can access rooms by Warp Boxes located behind the portraits, that vanish when Mario gets in front of them.
The piano room contains a giant piano with wavy keys, Boos, a Jump Blocks and a P Switch that, if pressed, causes a trail of coins to appear on the keys. The other side of the piano contains a Warp Box that leads Mario back to the main room.
The block room is an entirely dark room with a Giant Empty Block structure causing an optical illusion, that can be solved with 3D. This area contain four Warp Boxes and only one takes Mario back to the main room.
The book room, the main portrait area, is set in a library. It features a Fire Flower. It is the only room that is required to beat the level. The lower area contains a Boo and a ? Block and the upper area contains Peepas, books and a wooden corridor with three book stacks, the middle one turning invisible and revealing a Warp Box when Mario gets near it. This Warp Box leads Mario to a giant library with book obstacles and Peepas. The next area contains a tightrope, followed by a corridor with two stairs leading to three + Clocks. The next area contains a rope where a Big Boo appears if Mario approaches the end. After this, there is a door leading to the end of the level, where Mario can use teleporting platforms to reach the top of the Goal Pole.