List of Super Mario Bros. pre-release and unused content

This is a list of pre-release and unused content for the game Super Mario Bros.

Early iteration
The development of Super Mario Bros. began with a 16x32 pixel square used as a placeholder, which could not jump at all and moved about a single screen. After taking notice of the sales figures for Mario Bros., Takashi Tezuka proposed the idea of using Mario for the game to Shigeru Miyamoto, which was accepted. Visible checkpoints were considered in development.

The game was initially far more focused on shooting than platforming. Mario could carry weapons (with a rifle and a "beam gun" mentioned as being usable), and the control scheme was different; the up arrow of the was used to jump, while pressing  used whatever item Mario carried or kicked when empty-handed.

The game was initially divided between ground and sky segments, which had Mario riding a rocket (or a cloud in later stages of development) and shooting enemies. The sky-based bonus round of the final game are apparently a remnant of this idea.

Shigeru Miyamoto initially wanted Mario to ride a dinosaur-like creature in the game, but technical limitations of the NES prevented the concept from being implemented. This idea eventually evolved into Yoshi, who was able to be introduced in Super Mario World for the more powerful Super Nintendo Entertainment System.

The development sketches included in Super Mario All-Stars Limited Edition show that the game initially had screen-by-screen scrolling (similar to the later-released Super Mario Bros. Special) rather than continuous scrolling as in the final version.

Concept artwork was released in Super Mario Maker promotional videos. In one piece, it is shown that the Turtle Tribe were tentatively named and designed after the Shellcreepers from Mario Bros., in addition to a cut enemy resembling Koopa without a Shell from Super Mario World. Another piece shows a cut cannon-operating turtle resembling a Hammer Brother.

Ending theme
Koji Kondo originally composed the Ending BGM with an, but, since the song would take up too much memory, the "B" portion was cut. The original version of the ending theme was later used for the Famicom Disk System version of Super Mario Bros.: The Lost Levels.

Unused Game Over theme
An unused alternate version of the Game Over theme was found in the game's code. It was very similar to the regular Game Over theme, but was more simple.

Unused content
There is a brown ball that looks similar to the top of the flagpole. Mario can climb it similar to a vine. When climbed, Mario makes a buzzing sound.

A short Fire-Bar that rotates counterclockwise quickly, along with a few other Fire-Bars, can be glitched into the game.

Lakitu was supposed to throw Spinies in a curved fashion like he would starting with Super Mario Bros. 3. However, due to a glitch, he throws them straight down instead. This glitched behavior was carried over to Super Mario Bros.: The Lost Levels, Super Mario All-Stars, and Super Mario Bros. Deluxe, and the behavior is referenced in its Assist Trophy in Super Smash Bros. Brawl, Super Smash Bros. for Nintendo 3DS, and Super Smash Bros. for Wii U.