World 2-Castle (New Super Mario Bros.)

 is the last level and the castle of World 2, and subsequently, of New Super Mario Bros.. The boss here is Mummipokey.

Layout
This level is the final level of World 2. The level starts out with the player standing beneath a shallow stairway of brick blocks; these brick blocks are almost immediately pulverized by an enormous rolling ball of spikes. This spike ball will manage to avoid the first abyss, rolling shortly on the next platform; however, it quickly rolls back into the abyss. The player can now safely jump across the first abyss, nabbing three coins along the way. The player will find a ? Block with a coin inside right next to three more coins over the next abyss. The player can collect these as he or she jumps across the second abyss. Past here, the player will encounter many more of the spiked balls, though they vary in size. The player can find yet another ? Block containing a power-up - this can be useful when having to avoid the many obstacles of this level. Eventually, the player will see a divot that contains a massive spiked ball, ricocheting off of the walls as it rolls back and forth. Above this spiked ball is a rope. The player can grab a hold of this rope and swing over the divot to avoid danger. By swinging and landing low, the player will collect six coins and continue forth in the level; by swinging and landing high, the player will gain access to a previously-unseen group of platforms. These platforms host about thirty coins, and a ? Block containing a 1-Up Mushroom. Farther to the right, the player will see three more ? Blocks - two containing coins, the third containing a power-up. Past here, the player will have to crouch down into several small divots to avoid being harmed by roving spiked balls. The player will eventually see a Star Coin that must be accessed via the use of a few Wall Jumps, while avoiding yet another spiked ball. On the opposite side of the abyss, the player will encounter another spiked ball, followed by a door leading to the outside world.

In the outer sanctum of this castle, the player will encounter a great abundance of Bullet Bills and spiked balls. He or she must avoid multiple obstacles and traps to make it to the other side of the grounds, where access to the inside of the castle can be gained once again. The last two Star Coins can be received out here - one must be retrieved by jumping on a Bullet Bill to reach a high crevice, while the other can only be accessed via the use of a Mini Mushroom. At the end of the grounds, the player must press a ? Switch which lowers the ground, allowing access to the door that leads to Mummipokey.

Once the player defeats Mummipokey, the player will gain access to a new world. If Mummipokey is defeated while Mario or Luigi are in a miniaturized state, they will gain access to World 4. If Mummipokey is defeated by any other means, the player will gain access to World 3.

Star Coins

 * Star Coin 1 - After venturing through some of the level there will be a location high above. Using wall jumps, get to the location and avoid the spike ball that comes. The Star Coin should be able to be accessed by a small crevice.
 * Star Coin 2 - Hop off a Bullet Bill outside the castle or jump to it as Mini Mario or Luigi.
 * Star Coin 3 - Become Mini Mario or Luigi and enter the small crevice in the steps near the end of the level.

Enemies

 * Giant Spiked Ball
 * Spiked Ball
 * Bullet Bill
 * Bill Blaster
 * Mummipokey (boss)