Here, the Koopalings use the collective power of their wands to revive Bowser into the enormous Super Bowser he then stands up knocking them away, and roars, signaling the start of the true final battle. After defeating Bowser, however, Peach's cage is yanked off-screen, and Mario must ride a series of platforms upward to another room.

Like most of the previous games, Mario must get past Bowser and press the ! Switch to knock him into the lava. After the player gets the power-ups, they must go up the steps and dodge the fireballs that Bowser spews through the corridor before finally facing him. The player gets a second checkpoint right after the gate and gets three Item Blocks containing two Fire Flowers and a Super Leaf.

The path to the final battle starts similar to the one in World 8-Bowser's Castle from New Super Mario Bros. The player then enters the green doors to the final battle. After getting the Star Coin, the player must jump on another Donut Block or the platform in order to stay alive. On the first set in the middle row, the player must ride down the Donut Block to get the Star Coin. Near the middle of the section, there will be sets of Donut Blocks.

If the player is shot, they will temporarily turn to stone, immobilizing them for a few seconds, and consequently costing them a life if the moving platforms deposit them into lava. In order for the player to dodge, they must go behind the walls although the platforms are moving. Once the player enters the third section, there will be a Checkpoint Flag, and the Koopalings will ride on the Koopa Clown Car and try to turn the player into stone. Using the Super Leaf, the player can fly to the left and approach an area with a Dry Bones, two blocks that contain coins, and a Hidden Block that contains a 1-Up Mushroom. The player must then avoid the Burners while the Snake Blocks reach the platform on the door that leads to the third section. Before the blocks pass the platform with the Star Coin, the player must jump down to the platform to reach the Star Coin. In the second section, Mario/ Luigi must ride on the Snake Block. Near the stages going up, on the very right, there will be a Brick Block which will turn into a Gold Block. The Burners will start turning on and off near the middle of the first section. In the first section of the level, there are Burners on the track moving near the lava, and Lava Bubbles and Dry Bones can be found. This level is similar to World 8- in New Super Mario Bros.

Super mario bros 3 world 8 final castle