World 4-Castle (New Super Mario Bros.)

 is the castle and last level of World 4 in New Super Mario Bros.. The boss here is Mega Goomba.

Layout
The player will start off on a ledge. They will see a platform that will swing from left to right, along with a ? Block containing a coin. The player will see coins floating in the air, as well as another ? Block, this time containing a power-up. The player will now have to jump on another swinging platform, which will have a Dry Bones wandering on it. A Lava Bubble and another swinging ledge with a Dry Bones can be seen. If the player jumps when the swinging platform is at its max height, they will be able to get their first Star Coin. The player will fall down, and see a Dry Bones along with two ? Blocks, containing coins. Now, the player will see a couple of Thwomps. The player can take two routes from here, by either Wall Jumping while collecting coins, or jumping from platform to platform while avoiding a Thwomp. In the lone platform, there is a Hidden Block with a Star inside of it, along with two visible blocks containing coins. The player will see a couple of Dry Bones and a Big Thwomp. If the player waits while the Big Thwomp is crushing the blocks, they can get their second Star Coin. The player will find a ? Block, containing a power-up. The player will meet up with more Thwomps and Dry Bones, as well as another Big Thwomp. The player will collect some coins and find a Dry Bones here. The player will then be at the checkpoint area, and see a ? Block containing a power-up, a Lava Bubble, and another ? Block which will have a 1-Up Mushroom. The player will be on a swinging platform, and see their last Star Coin. The player must jump from the swinging platform to another, while avoiding a Dry Bones and many Lava Bubbles. The player will then see a boss door, and will have to battle Mega Goomba. After the player has defeated it, they will have access to World 5.

Star Coins

 * Star Coin 1 - Mario should jump off the platform when it's at its max height to get to the Star Coin on a ledge.
 * Star Coin 2 - Mario should have the Big Thwomp destroy the three rows of blocks that guard the second Star Coin.
 * Star Coin 3 - After getting on the swinging platform, Mario should jump off of it to land on the ledge below where the final Star Coin is.

Enemies

 * Dry Bones
 * Lava Bubble
 * Thwomp
 * Big Thwomp
 * Mega Goomba (boss)