World 5-Castle (New Super Mario Bros. 2)

 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.

Layout
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 Cannon Pipe to be launched through Bone Piranha Plants. He must then fight Ludwig van Koopa.

During Ludwig's battle, he hangs on chains and shoots three blasts at Mario. To hit him, Mario must use the Cannon Pipes. 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.

Star Coins

 * Star Coin 1: Not too far before the checkpoint, there is a hidden red pipe that can be reached with hidden blocks. The red pipe takes Mario directly to the Star Coin.
 * Star Coin 2: Immediately after the checkpoint, the Star Coin is floating over the lava. Mario must wait for the grating to rise from the lava to get it.
 * Star Coin 3: Once the vertical rectangular grating begins to sink into the lava, Mario should wait until he is able to grab the third Star Coin. Then, Mario can leap towards the next fence before he sinks into the lava.

Enemies

 * Climbing Koopas
 * Lava Bubbles
 * Dry Bones
 * Bone Piranha Plants
 * Big Bone Piranha Plants
 * Boss: Ludwig von Koopa