List of Super Mario Bros. 2 pre-release and unused content

This is a list of beta elements of the game Super Mario Bros. 2 and its remake, Super Mario Advance.

See also: Yume Kōjō: Doki Doki Panic.

Prototype cartridge
In 2005, a prototype copy of Super Mario Bros. 2 sold on eBay for $350. It was significantly different from the final release version of SMB2.

The prototype cart has a SNROM-02 motherboard rather than the final version's TSROM-04. This means that it uses CHR-RAM instead of CHR-ROM and utilizes batteries. This was probably changed because SNROM-02's ROM size is 1 Megabit, rather than TSROM-04's 2 Megabits.

The title and story screens of the prototype use a different color palette, which includes tans and oranges, as opposed to the final version's red and blue scheme. This color scheme returns in Super Mario USA, with a blue sky.

On the prototype version's character select screen, an ellipsis divides the phrase "EXTRA LIFE" from the number of lives remaining. Strangely, the ellipsis returns for Super Mario All-Stars.

The character's sprites are not significantly different between the two versions, but Mario and Luigi lack sclera in the prototype, and the Princess's sclera are pink. This may be because Mario, Luigi, and Peach's sprites have more colors than the NES hardware can normally handle, and so their sclera actually have to be rendered as a separate sprite from the rest of their bodies.

Several other character sprites are slightly different. For example, the princess has more hair in the prototype. One noticeable incongruity of the prototype's sprites is that, although all the "item carrying" sprites are finished, the items being carried float at the height the original Yume Kōjō: Doki Doki Panic characters would have carried them at.

In DDP, players couldn't use the B button to run; this was in fact, almost exclusive to Mario games at the time. This mechanic hadn't been added when this prototype was compiled.

The prototype used a magic lamp to access subspace, as did DDP. The final version used a magic potion.

In the prototype the player only had to throw four vegetables at Wart to defeat him. The ending also gave out Prize Money instead of Contributions. Depending on how many times the character died, the player would be rewarded with a different amount of money at the end of the game.

{| style="text-align: center; width: 25%; margin: 0 auto; border-collapse: collapse;" border="1" cellpadding="1" cellspacing="1" !Times Died !0 - 3	!4	!5 - 9	!10 - 12 !13 - 18	!19+
 * -style="background: #ABC;"
 * Prize Money
 * $10 000 000
 * $1 000 000
 * $500 000
 * $100 000
 * $50 000
 * $10 000
 * -}

For a complete comparison, see here.