World Flower-Castle

 is the castle of World Flower in New Super Mario Bros. 2. The boss of this castle is Lemmy Koopa.

Layout
This castle is made up of grey bouncing mushroom platforms and conveyor belts. Mario begins on the castle floor beside one of the bouncy mushrooms and a conveyor belt. Moving on, there is a blue pipe between two bouncy mushrooms which will constantly release Bone Goombas under a Question Block containing a Fire Flower. Further down, two red pipes on the ceiling can be found constantly releasing Bomb-ombs. More Bone Goomba-releasing pipes can be found. The next section features blue and red pipes releasing Bone Goombas and Bomb-ombs respectively at the same time above several conveyor belts. This is followed by the checkpoint. More conveyor belts follow along with bouncy mushroom platforms and Bone Goombas-releasing pipes. Mario will have to jump over several gaps at this part. After that, there is an area with bouncy balls, found previously in World 3-Castle of New Super Mario Bros. Wii, which bounces around below several Brick Blocks which push Mario away or assists him in bouncing. One of the Brick Blocks is a Coin Block. After that are more conveyor belts and Bone Goomba and Bomb-ombs releasing pipes between yellow platforms which constantly moves up or down. After that, there is a blue conveyor belt moving left and a switch on the ceiling. This switch reverses the direction of the conveyor belt and changes it's colour to red, and vice versa. Several more conveyor belts follow, along with two Question Blocks with coins, and the boss door.

Boss Battle
Here, Mario will have to defeat Lemmy Koopa. This takes place in a room on a conveyor belt. Its direction can be reversed with a switch on the ceiling. Lemmy's attacks are like those in World 3-Castle of New Super Mario Bros. Wii, making bouncing balls appear to push Mario off the conveyor belt. Lemmy will occasionally move from right to left and vice versa. When he does this, he will first release a bouncing ball which will push the switch on the ceiling and reverse the conveyor belt's direction, so that Mario will move away from him. Mario will have to stomp Lemmy's head three times, avoiding his shell attacks. The key to the next world, World 5 will then appear and the level is then completed.

Completing this level will unlock World 5-1.

Star Coins

 * Star Coin 1: This Star Coin is found underneath several unbreakable stone blocks between two conveyor belts under the first two red pipes releasing Bomb-ombs. Mario will have to light up and carry a Bomb-omb to the stone blocks to break them and then carry another and drop it down to the Star Coin.
 * Star Coin 2: This Star Coin can be easily found and collected above a bouncy mushroom platform under two Bone Goombas-releasing pipes after the checkpoint.
 * Star Coin 3: When reaching the blue conveyor belt before the boss door, Mario needs to push a switch on the ceiling and reverse it's direction, then stand on the conveyor belt and crouch until he enters an area with the two bouncy balls and the Star Coin.

Enemies

 * Bone Goombas
 * Bob-ombs
 * Boss: Lemmy Koopa