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

The beta elements of the Nintendo 3DS game, New Super Mario Bros. 2, are listed in this page.

Early Builds

 * As seen in the screenshot below, the number of coins would originally have an "x" next to it, as in the original, but this is changed in the final version.
 * Nintendo considered this game to be called New Super Mario Bros. Gold, but due to some of the over 80 stages being said to stand on their own outside the coin theme of the game, the game was renamed to New Super Mario Bros. 2.
 * Also, the athletic theme used to be the same as the New Super Mario Bros. Wii theme, but was remixed with the added vocals in the final version.
 * As shown in the E3 trailer, originally only 5 coins were given for each consecutively defeated enemy under the effects of the Gold Ring. In the final version, the amount of coins rewarded is 5, 10, 15 and 20 for the first four golden enemies defeated consecutively and 50 after that.
 * The underground section of World 2-1 was designed differently than in the final version. In the final version, the pipe led into a room with Brick Blocks at the end, blocking another exit that could only be entered via a Gold Flower. This part wasn't in the beta version. Also, in the same level, the area just before the Warp Pipe exit of said section was also designed differently.
 * Originally, the Reznor boss fight had the same music as the Koopalings Tower fight in New Super Mario Bros. Wii, but this was changed to a remix of the Super Mario World Boss theme in the final version.
 * The pipes in World 4-2 were originally purple but are now red. Also the Brick Blocks are brown instead of gray in the level.
 * The title screen music originally had different vocals.
 * The coin table, that tallies up every coin collected, originally had a sack icon with Mario's 'M' emblem on it, similar to Money Bags. This icon was changed to three different stacks of coins in the final version.
 * The names of Solo Play and Co-op Play, were originally One Player and Two Player, respectively. In most translations, other than English, the modes are still called One and Two Player mode.
 * Thwomps had a purple effect by crashing the floor. In the final version the effect is yellow.
 * Jump Blocks made different sounds than in the final version.
 * As seen in a beta Co-Op video, W 1-3 is a little bit redesigned in the final edition.

Coin Rush
Platform Panic Pack was named the seventh Coin Rush DLC pack instead of the eighth. This implies that Coin Challenge C was to released later, or didn't exist at the time.