World Star (New Super Mario Bros. 2)

World Star is the final world that appears in New Super Mario Bros. 2. It requires 90 star coins to enter it. Dry Bowser is the boss of the castle. It can be unlocked by beating Bowser in World 6. Unlike the first worlds, has Star Coins with moons imprinted on them rather than stars. 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. Destroying too many Brick Blocks can open up bottomless pits, though there are some Used Blocks that prevent the level from becoming impossible. There is a Red Ring that has a Coin Coffer come out, when defeated it will give out Red Coins.

Star Coins

 * Star Coin 2: The player needs to throw a Koopa Shell into the group of blocks hanging over the Star Coin or throw a Koopa Shell directly at it from the left.
 * Star Coin 3: The player should jump down before hitting the ? Switch to get the last Star 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, making this level loosely similar to Sky Sanctuary Zone from Sonic the Hedgehog 3. Super Leaves appear here, aiding Mario throughout the level. The level is abundant in Red Koopa Troopas, Donut Lifts and moving platforms.

Star Coins

 * Star Coin 1: Directly above a moving platform just after two POW Blocks.
 * Star Coin 3: Under some Donut Lifts, Mario will need to jump as soon as he gets the Star 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.

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. He will breath out blue Fireballs before jumping, allowing Mario to hit the ! Switch.

Trivia

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