World Star (New Super Mario Bros. 2)

World Star is the final world that appears in New Super Mario Bros. 2. It has 9 levels and a toad house. Of the levels, there is 7 numbered levels, a castle and a rainbow level. It requires 90 Star Coins to enter it. An additional 9 Star Coins are needed to access the only Toad House in this world. Dry Bowser is the boss of the castle. It can be unlocked by beating Bowser in World 6. Unlike the first eight worlds, has Star Coins with moons imprinted on them, rather than stars. (called Moon Coins). World Star appears to be similar to World 9 and World S, as they are all bonus worlds unlocked by beating the final boss.

This level take place at night. It consists of many Brick Blocks and ? Switches which can be used to make various groups of Brick Blocks rotate on a point. Goombas and Koopa Troopas are the main enemies of the stage.

Moon Coins

 * Moon Coin 1: The player needs to hit the right brick to use the P-Switch. Once pressed, bridges will temporary open up, and the player needs to fall all the way down. Once down there, there's a Cannon Pipe, which shoots the player through the first Moon Coin.
 * Moon Coin 2: The player needs to Ground Pound two rows of bricks, at the right of the Moon Coin, and then use a Koopa Shell to get it.
 * Moon Coin 3: The player should jump down before hitting the ? Switch to get the last Moon Coin.

This level takes place high in the sky, on top of what is supposed to be a deserted castle, where grass and other vegetation has grown on the rooftops. Super Leaves appear here, aiding Mario throughout the level. The level is abundant in Red Koopa Troopas, Donut Lifts and moving platforms.

Moon Coins

 * Moon Coin 1: Directly above a moving platform just after two POW Blocks.
 * Moon Coin 2: After the checkpoint, the player can see the Moon Coin above a pit. The player needs to use the Koopa Shell, on the right, in order to get the Moon Coin.
 * Moon Coin 3: Under some Donut Lifts, Mario will need to jump as soon as he gets the Moon Coin.

This rather short level's theme is a combination of a beach and Ghost House theme. Seven Whomps and four Super Whomps are in this level. There are also seven groups of Peepas throughout the level.

Moon Coins

 * Moon Coin 1: Before the checkpoint, there is a blue pipe. To the left of the pipe is a hole. The player should go in the hole and avoid the Peepas to get the Moon Coin.
 * Moon Coin 2: After the checkpoint, the player should stand on the platform AFTER the second Whomp. Some blocks will appear, allowing Mario to reach the second coin.
 * Moon Coin 3: Before the end of the level, the player should have the last Super Whomp fall. Then, the player should use him as a platform to get on top of the high ledge. Follow the coins over to a ledge with 3 coins. Stand in the middle to hit an invisible vine block. The player can climb the vine to reach the Moon Coin.

This is an auto-scrolling beach-themed level. It features a Porcu-Puffer which chases Mario all the way through the stage, wooden lifts and moving platforms. Koopa Troopas are found along the way as well.

Moon Coins

 * Moon Coin 1: The first Moon Coin is just before the Midway Flag, above a wooden structure. It is in clear view on the left.
 * Moon Coin 2: At the end of the Porcu-Puffer area is a Mini Pipe. To enter it and get the Moon Coin, Mario must be Mini Mario.
 * Moon Coin 3: The final Moon Coin is in the last area of the level. It is found under a bouncing platform.

This level combines the elements of grass and sky. Lakitus appear alongside red and green Koopas and Paratroopas. The level also contains a Gold Ring and Dropping platforms.

Moon Coins

 * Moon Coin 1: At the star of the level, Mario should defeat the first Lakitu and take his cloud. Then Mario should ride the cloud up to get the first Moon Coin.
 * Moon Coin 2: The second Moon Coin can be seen on the balancing platforms after the checkpoint. Ride the balancing platform down to the second Moon Coin.
 * Moon Coin 3: Mario should defeat the final Lakitu before the flagpole and acquire his cloud, then ride it upwards to a Warp Pipe, inside is the third and final Moon Coin.

Most of this level takes place in an underwater fortress. It begins on a small emerged area of the fort, with a ghostly background and three Brick Blocks. To the far right there is a vertical passage with coins, leading to an underwater place, where Mario must reach a Warp Pipe avoiding Fishbones. This pipe leads the plumber to a horizontal, auto-scrolling corridor featuring more Fishbones, coins, blocks and other items. At the end of the passage, there is another Warp Pipe leading to the Flagpole area.

Moon Coins

 * Moon Coin 1: This Moon Coin can be easily collected at the start of the main area of the level. However, it's guarded by two Fishbones.
 * Moon Coin 2: Entering a purple pipe in the underwater area, Mario can get the second Moon Coin in a small room.
 * Moon Coin 3: The third Moon Coin is at the end of the main space, among some Fishbones.

Moon Coins

 * Moon Coin 1: This Moon Coin is above a single Donut Lift near a Podoboo
 * Moon Coin 2: For this Moon Coin the player has to go past the Checkpoint Flag and jump between two blocks to find a hidden block with a Beanstalk. The Moon Coin is located in the secret area which can be reached with it.
 * Moon Coin 3: This Moon Coin is located on a Donut Lift between two rocks. It is guarded by diagonal jumping Podoboos.

There are 2 parts of the final castle. The first part has many Grinders and also has the Koopalings blasting Mario like they did in Bowser's Castle. There are also ropes and fences Mario can climb on. The second has Grinders and the Koopalings but Mario is now on a Snake Block. At the end Mario battles Dry Bowser. On the first phase, he will breath out blue Fireballs before jumping, allowing Mario to hit the ! Switch. On the second phase, the Koopalings make Dry Bowser large. Mario will have to jump on platforms to reach the Giant ! Switch.

Moon Coins

 * Moon Coin 1: The first Moon Coin is located above lava on a fence.
 * Moon Coin 2: The second Moon Coin is located on Donut Lifts which are located below spikes.
 * Moon Coin 3: For the last Moon Coin the player has to climb on the first fence in the Snake Block area to make the Moon Coin collectible.

Trivia

 * This is the only special world to not be unlocked via a cannon.