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. 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 features many Brick Blocks and ? Switches. There is a Red Ring that has a Coin Coffer come out, when defeated it will give out Red Coins. It also has rotating blocks.

Star Coins
Star Coin 3: The player should jump down before hitting the ? Switch to get the last Star Coin.

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, he will then jump so Mario can hit the ! Switch.

Trivia

 * Unlike the first worlds, has Star Coins with moons imprinted on them rather than stars.
 * This is the only world to feature no Fortress, and no Mushroom Houses.
 * This is the only special world to not be unlocked by a cannon.