World 6-Bowser's Castle
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This level is similar to World 8- in New Super Mario Bros. Wii. In the first section of the level, there will be Burners on the rope moving near the lava. Then Lava Bubbles and Dry Bones will be waking up near the stage. The Burners will start turning on and off near the middle of the first section. Near the stages going up, on the very right, there will be a Brick Block which will turn into a Gold Block. In the second section, Mario/Luigi must ride on the Snake Block. Before the blocks pass the platform with the Star Coin, the player must jump down to the platform to reach the Star Coin. Then the player must avoid the Burners while the Snake Blocks reach the platform on the door that leads to the third section. Once the player enters the third section, the Koopalings will ride on the Koopa Clown Car and try to blast the player. In order for the player to dodge, they must go behind the walls although the platforms are moving. If the player is shot, they will temporarily turn to stone, which in most cases will result in the player losing a life as they will not be able to move for a few seconds; consequently this is enough time for the player to fall into lava due to the moving platforms. Near the middle of the section, there will be sets of Donut Lifts. On the first set in the middle row, the player must ride down the Donut Lift to get the Star Coin. After getting the Star Coin, the player must jump on another Donut Lift or the platform in order to stay alive. Then the player will enter the room to the final battle.
The path to the final battle starts similar to the one in World 8-Bowser's Castle from New Super Mario Bros. Wii. The player gets a checkpoint right after the gate and gets three Item Blocks containing two Fire Flowers and a Super Leaf. After the player gets the power-ups, they must go up the steps and dodge the fireballs that Bowser spews before finally facing him.
Like most of the previous games, Mario must get past Bowser and press the ! Switch to knock him into the lava. After defeating Bowser, however, Peach's cage is yanked off-screen, and Mario must ride a series of platforms upward to another room. Here, the Koopalings use the collective power of their wands to make Bowser into the enormous Super Bowser; he then stands up knocking them away, and roars, signaling the start of the true final battle. Mario must now climb up a series of rising platforms that fall when he touches them, while avoiding the lava below him and dodging Super Bowser's claws and occasional flame attacks. Upon reaching the giant ! switch at the top and pressing it, the floor collapses under Super Bowser, causing him to fall and defeating him once more. Mario then finally frees the princess and escapes the castle.
Later on, the Koopalings attempt to carry Bowser away in the Koopa Clown Car, but Bowser weighs them down and causes the vehicle to crash.
This course is never selected in the Coin Rush game mode, due to the sheer length of the Bowser battle.