World 8-Bowser's Castle (New Super Mario Bros. Wii)
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For the first (out of two) rooms there are a lot of Lava Bubbles, which will jump out of the lava to attack the player. They can be stopped by an Ice Flower, while the Firebars that also appear need to be avoided. The second room has a lot of falling platforms and sinking lava, but the platforms fall faster than the lava. In the last room, there is a big green door leading the player to the final battle against Bowser himself. The player needs to make sure to reach the Checkpoint Flag first before Mario enters the final showdown against the Koopa King. On the far right of this room by the door to the final battle, there is a hidden block that contains a Mushroom or a Fire Flower that will help him in the final fight. Then, Mario enters the giant green final door leading to the final battle.
In the first phase of the battle, Bowser will breathe fireballs at Mario. Mario must wait for Bowser to jump so he can go under Bowser and hit the switch. Bowser will fall, but the person in the cage whom Mario was expecting to be Peach turns out to be Kamek in disguise, unfortunately. Kamek will make Bowser grow, but to his astonishment, Bowser grows too much. He spits fireballs at the player and breaks the walls (or obstacles) while chasing them. He can also stomp to create hazardous lava waves. Propeller Mushrooms and Fire Flowers can help Mario in this chase. Eventually, after hopping on several floating platforms, Mario will see a giant orange switch at the end of the room with an exclamation mark on it with Peach above. Mario hits it, causing the lava to sink, along with Bowser. The final victory fanfare is heard and Peach falls down, and they go outside where they see Luigi and the Toads on their Hot Air Balloons. Luigi lets them go and as he is about to enter, the balloon leaves him behind, so the Toads decided to let Luigi enter the other balloon. Then, Peach tells Mario about the secret world, World 9, but if Mario beats the level again, Peach will ask Mario to tell her about his adventure again. After the cutscene, the credits, which are made of breakable Brick Blocks, begin.
Then, after the credits, Larry Koopa and Bowser Jr. come in and see that Mario and his friends are returning home on their hot-air balloons. Bowser Jr. points Larry to the other six Koopalings, who are pushing Bowser. Then, the castle begins to fall after Bowser is pushed over, crushing Bowser, Bowser Jr. and the Koopalings.