World 5-Castle (New Super Mario Bros. 2)
From the Super Mario Wiki
World 5-Castle is the Castle level of World 5 in New Super Mario Bros. 2. This level is a lava level, and it centers around fences. It includes a unique type of fence that can be changed to move up or down the track using or .
Mario begins the level next to a fence with a Climbing Koopa on it. A fence on a track is then found, and it must be punched to reach a platform above. Mario then encounters Dry Bones and two ? Blocks, one of which containing a power-up. A fence moving above a spike pit is found, followed by a Lava Bubble and a Bone Piranha Plant on the ceiling. A Dry Bones and more ? Blocks are found, along with another fence that moves on a track. Mario must dodge a spike pit and Bone Piranha Plants while riding the fence. Mario then arrives at the Checkpoint Flag and two more ? Blocks. He must climb on a fence with two Climbing Koopas on it, then a fence on a track. A Red Ring and more Bone Piranha Plants are then found. Another fence with a Climbing Koopa on it is found, followed by a tall fence on a track. Mario must jump onto a smaller fence to avoid falling in the lava, and must avoid a Big Bone Piranha Plant. The boss door is then found, leading to an area where Mario must get in a Pipe Cannon to be launched through Bone Piranha Plants. He must then fight Ludwig von Koopa.
During Ludwig's battle, he hangs on chains and shoots three blasts at Mario. To hit him, Mario must use the Pipe Cannons. After one hit, he upgrades his blasts to four from three. After another hit, he swings on the chain, making attacks more difficult. After Mario and Luigi defeat Ludwig, they see Princess Peach in a caged Koopa Clown Car. Before the Bros. can free Peach, the Clown Car traps Peach in a cage and is taken away to the final world, World 6, and all the way to Bowser's Castle.