List of New Super Mario Bros. pre-release and unused content
These are beta elements from Mario & Luigi: Bowser's Inside Story.
Beta Elements
The working title for this game was Super Mario Bros. DS. Also, during early stages of production, Mega Goombas were going to be a generic species (the result of a Goomba colliding with a Super Mushroom and powering up) rather than an individual boss. (It is possible that other enemies were to be compatible with this situation, too, considering the giant enemies like Super Dry Bones and Super Piranha Plant that remain in the game in generic, already-large forms.) There was also supposed to be a Mario and Luigi co-op mode at a time. Interestingly, an illustration of beta map icons still exists as a screenshot on page twelve of the final game's manual. There were originally three item reserve spots rather than one. There also was an underwater stage which also featured Manta Ray in VS. Mode. Spindrift was also supposed to be in the game, but got replaced by the blue spinning platforms in World 1-3 and other levels.
In another image, it's possible to obtain the Blue Shell by first defeating a Blue Koopa Troopa. Then when the player Ground Pounds on the shell, the player gets in the shell and becomes Shell Mario. This feature is removed possibly because the designers wanted a power-up that can be obtained from a ? Block, however it survives in Vs. Mode. Mega Mushrooms were also originally intended to be red. The advertisement accenting the Vs. mode revealed some levels that were not available on the final release, including a desert stage, an underwater stage and a few others. The Mega Mushroom was going to look like a large Super Mushroom rather than a chubby-looking mushroom that was yellow with red spots.
It was possible to kick and punch in the game but is also removed.
The game contians among its minigame data sprites and graphics from Wrecking Crew. The file names suggest that these sprites were intended to be in both a single and multiplayer minigame. There is also data to support a single player snowball throwing minigame (which was actually used in Multiplayer Mode), that was probably scrapped due to the DS's inability to support sophisticated enough AI.
- Beta3 NSMB.jpg
A Giant Whomp attacking Mario and Luigi. Also note the blue box from Super Mario 64. - The Original NSMB.jpg
The original opening title of New Super Mario Bros. - Beta4 NSMB.jpg
Some type of rope land. 
The Mega Goomba species. - Beta2 NSMB.jpg
An unused underwater stage. - Beta9 NSMB.jpg
Notice the designs of the item boxes and Spindrift. 
Mario and Luigi going around the level. Additionally, the bottom screen looks different. 
A demonstration of how to obtain the Blue Shell powerup. 
The original World 4 castle. Note that the bottom screen says Fortress.
An unused spooky level.
The beta map icons from page twelve of the final game's manual.
- Beta1 NSMB.jpg
An unused desert that remains in the game's code.
- Beta8 NSMB.jpg
An early Mega Goomba boss battle.
- Beta10 NSMB.jpg
The brothers in an unused castle level with more simple-looking lava.
- Beta5 NSMB.jpg
An unused secret area with many objects not seen in the final game.
- Beta6 NSMB.jpg
A World 8 style level with rocks falling from the sky.
- Beta7 NSMB.jpg
A water level similar to the final game but with a more colourful background.
