World 1-Castle (New Super Mario Bros. 2)
From the Super Mario Wiki, the Mario encyclopedia
First off, Mario needs to climb a rope on the ceiling while avoiding the moving spiked platforms and walls, and also Lava Bubbles and the lava. A ? Block containing a Super Leaf can be found next, followed by more Lava Bubbles and rope climbing. Rising and sinking platforms, Dry Bones and more Lava Bubbles then appears, followed by the checkpoint. A Coin Block, which can be changed into a Gold Block, can be found along with the ? Block containing the power-up. Mario will then have to rope-swing to the other platform. An area full of Thwomps comes after, and more rope-swinging, rising and sinking platforms, and Lava Bubbles. Another Super Leaf can then be found. Mario now has to rope-swing and avoid the Thwomps at the same time. A Big Thwomp then appears, followed by the boss door. A Super Leaf can be found in a hidden block to the right wall of the boss door.
Roy Koopa is the boss of this level. The boss battle plays out similar to his boss battle in Super Mario World, with the walls of the room slowly becoming narrower every time Roy is hit. Roy charges at Mario at first, and changes directions if he misses. However, if Mario can bait Roy into hitting either wall, he collides with it and become dizzy temporarily. Mario can take this chance to hit Roy by jumping on his head. He will then perform a shell attack, which Mario must avoid. After a moment, Roy will return and shoot a ball of magic, which Mario must also avoid. Roy will then charge again at a faster speed, and Mario must again bait him into ramming into a wall to stun him. Mario must jump on Roy's head three times before the key to the World 2 is released.