World 4-A (New Super Mario Bros. 2)

World 4-A is the first secret level of World 4 in New Super Mario Bros. 2. A payment of five Star Coins is required to unlock this level.

Layout
This level is full of bouncy mushroom platforms. First, Mario can see the first Star Coin and two Goombas that are bouncing on the mushrooms below a long orange platform. This is followed by several ? Blocks, one of which contains a Fire Flower. There are pipes which releases Goombas to the bouncy mushroom platforms. After crossing there is a Red Ring. Furthur down are some Goombas and the checkpoint. More bouncy mushroom platforms can then be found along with a single Coin Roulette Block. More Goomba-releasing pipes can be found above several mushroom platforms and orange platforms. Another long orange platform can be found. This platform is low enough to cause bouncing Goombas from Goomba releasing pipes below to reach the long orange platform. After that are several more bouncy mushroom platforms along with bouncing Goombas, and the flagpole.

Completing this level will unlock World 4-Fortress, skipping World 4-Ghost House and World 4-2.

Star Coins

 * Star Coin 1: This Star Coin can be seen immediately after Mario enters the level, under the orange platform. To obtain it, Mario needs to move further until he can find several Brick Blocks on the orange platform. Super Mario or powered-up Mario then needs to ground pound these blocks to access the bouncy mushroom platforms below. Mario then needs to go towards the left while avoiding the bouncing Goombas and being careful not to bounce too high to obtain the Star Coin.
 * Star Coin 2: After the Coin Roulette Block immediately after the checkpoint, there are some Goomba-releasing pipes above orange platforms. In between is the Star Coin. To obtain it, the player can leap from the orange platforms to the Star Coin. Otherwise, the player can bounce to the coin using a bouncing Goomba. Obtaining the Star Coin will cause a fountain of coins to be released from below.
 * Star Coin 3: When Mario reaches the long orange platform area after the checkpoint, the player can see a single ? Block next to a Brick Block. Mario needs to ground pound the ? Block to release a Mini Mushroom, which will travel towards the right and bounce on the mushroom platforms. Mario then have to travel to the end of the orange platform, where the Star Coin is and obtain the Mini Mushroom. Mini Mario can then fit into a small gap below a Goomba-releasing pipe and jump to the Star Coin, avoiding the Goombas.

Enemies

 * Goombas