World 4-Castle (New Super Mario Bros.)
From the Super Mario Wiki
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The player starts off on a ledge. They see a platform that swings from left to right, along with a ? Block containing a coin. The player sees coins floating in the air, as well as another ? Block, this time containing a power-up. The player now has to jump on another swinging platform, which has a Dry Bones wandering on it. A Lava Bubble and another swinging ledge with a Dry Bones can be seen. If the player jumps when the swinging platform is at its max height, they are able to get their first Star Coin. The player falls down, and sees a Dry Bones along with two ? Blocks, containing coins. Now, the player sees a couple of Thwomps. The player can take two routes from here, by either Wall Jumping while collecting coins, or jumping from platform to platform while avoiding a Thwomp. In the lone platform, there is a Hidden Block with a Super Star inside of it, along with two visible blocks containing coins. The player sees a couple of Dry Bones and a Super Thwomp. If the player waits while the Super Thwomp is crushing the blocks, they can get their second Star Coin. The player finds a ? Block, containing a power-up. They then encounter more Thwomps and Dry Bones, as well as another Super Thwomp. The player collects some coins and find a Dry Bones here. The player is then at the checkpoint area, and can see a ? Block containing a power-up, a Lava Bubble, and another ? Block which contains a 1-Up Mushroom. The player is on a swinging platform, and is near the last Star Coin. The player must jump from the swinging platform to another, while avoiding a Dry Bones and many Lava Bubbles. The player then sees a boss door, and has to battle Mega Goomba. After the player has defeated it, they gain access to World 5.