New Super Mario Bros./Unused Tiles


 * Object Defined: These have graphics, are set in Map16 (so likely have behaviour set), and are set as objects. The stage the Tiles are defined indicates how early they were cut.
 * Map16 Defined: These have graphics and are set in Map16 (so likely have behaviour set).
 * Graphics Defined: These only have graphics.

Various
Things that appear in multiple tilesets

Lava Tile


A lava tile. Unlike the unused water, it has animation. It appears in the castle, volcano, tower and Bowser Jr tilesets.

NSMB E3 — Early Prototype (0:45)

New Super Mario Bros Beta Trailer 2005



Common
Things used in every level.

Water Tile


A non-animated water tile. Mario goes behind the tile.

Water Coin
A coin that was meant to be used with in the unused water but it causes the water to disappear when the coin is collected.

Round Yellow Coin Outline


A round coin outline that turns into a Yellow Coin that can not be collected when an ! Switch timer is on.

Round Red Coin Outline


A round coin outline that turns into a Red Coin that acts like a Yellow Coin when an ! Switch timer is on.

? Block: 5 Coins
When hit, coins slowly float out over 45 degrees.

? Block: Mushroom
A ? block that produces a mushroom no matter what power-up the player is currently. There is also an invisible variety of this.

There is also a question block that lets out a mushroom if Mario is small and a coin otherwise.

? Block: Throw Coin
A ? block that throws out a coin, like the ones used in ghost houses that throw out a power-up.

Destroyed Tiles
This tileset has unused tiles which are made up of "X" patterns which have no tile behaviour set. The X pattern tiles is to show that the tiles are "Not to be used". They appear in Unused Level 1 and from the way they are used there, it appears that they used to be mushroom platforms like in the sky tilesets. Early versions of the game featured mushroom platforms in ground levels, as you can see in some screen shots and videos.

Line Guides
The tileset also has line guides which have the line guide tile behaviour set (this enables sprites to follow it). These tiles are used in Unused Level 2, wherein platforms follow them.

Final Boss Door
The final boss door, marked for deletion, strangely appears in the tower tileset. Perhaps the door was to be used as a standard boss door?

Pillar


A pillar. Mario can walk past it.

Ice Block


It uses different graphics compared with the used ice block, it just acts like a normal solid block, it isn't slippery.

Solid-On-Top Platform


Underground tileset styled platforms were replaced with generic solid-on-top Platforms.

Cloud


A cloud platform that was replaced by a THING version that compresses on step.

Ghost House
Out now in cinemas near you, very near you — actually, it's that new cinema mysteriously built right by your house. Yes, that one; How Strange.

Dark Doorway


A dark doorway with a light on top. It has the normal door behaviour, which doesn't look right when used because a door appears out of nowhere.

Boo Statue


A statue of a boo. The stand was probably meant to be copied and flipped around in Map16, so it would look like this:



Boss Room


These actually is a group of these tiles covered up by the used green tiles on the right of the first Bowser arena.

Grey Bricks


They use similar colours to the stone blocks that are beside them. They were probably meant to be used in-between the blocks.

Early Boss Room


The tileset is covered with Xs to mark it as "Not to be used". A Mega Goomba once occupied a room made with these tiles in early versions of the game - without the Xs.