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, aswell 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 Podoboo 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 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, either Wall Jump 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 one's containing coins. The player will see a couple of Dry Bones and a Super Thwomp. If the player waits while the Super 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, aswell as another Super Thwomp. The player will collect some coins and find a Dry Bones here. The player will now be at the checkpoint area, and see a ? Block containing a power-up, a Podoboo, 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 Podoboos. The player will now see a boss Door, and will eliminate Mega Goomba. After the player has defeated it, they will now have access to World 5.

Star Coins

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

Enemies

 * Dry Bones
 * Podoboo
 * Thwomp
 * Super Thwomp
 * Mega Goomba (boss)