Newer Super Mario Bros. Wiki
This article is about the final level of Koopa Planet in Newer Super Mario Bros. Wii. Not be confused with other levels related to Bowser's Castle.
Newer Super Mario Bros. Wii
Newer Super Mario Bros. Wii Plus
Bowser's Castle
Game Newer Super Mario Bros. Wii
Level number 8-Castlensmbw2.png
Time 500
World Koopa Planet
Level type Bowser's Castle
Enemies Big Dry Bones
Dry Bones
Koopa Troopas (Red)
Mega Magma Podoboos
Sledge Bros.
Game Progression
Previous level (8-4) Molten Airship
Next level (8-Train.png) Underground Railroad

Bowser's Castle (or World 8-Castlensmbw2.png) is the castle and the sixth and final level of Koopa Planet in Newer Super Mario Bros. Wii. It's a fortress posing as Bowser's hideout, though making it through reveals what it truly is. No boss is fought at its end.

Bowser's Castle is unlocked by completing Molten Airship. Completing it will unlock Underground Railroad in Koopa Core.


This level is designed much like a normal castle without a notable theme. This castle is a trick castle where the title suggests that Bowser is fought at the end, while there is no boss much like the castles in the lettered worlds. The door at the end leads to a large area with Princess Peach captured in a cage, but hitting the switch will instead cause the bridge to collapse, causing Mario to fall into an underground cavern, signaling the start of Koopa Core.

Star Coins

  • Star Coin 1: After the first series of swinging platforms, take the bottom path below the stone platforms. Avoid the Podoboos in the way of the Star Coin and collect it.
  • Star Coin 2: Near the area with the Sledge Bro, take the path below it in a system of paths, the second one from the top. Head to the right and you will find a red Warp pipe in the hidden wall. Enter it to enter an area with a fast swinging platform, and jump off of it to collect the second Star Coin.
  • Star Coin 3: Before the final door, there is a double Fire Bar. The Star Coin is visible in this area; you will need to avoid the Fire Bar to collect it safely.




Name Music Origin Area played
Castle Original song. Main areas
Fire Original song. Exit area