Koopa Troopa Cave

Koopa Troopa Cave, otherwise known as World 1-2, is the second standard course of World 1 in Super Mario 3D World. The course takes place in an underground cave with Koopa Troopas, Goombas, and clear pipes. It is unlocked by beating Super Bell Hill and its completion unlocks Chargin' Chuck Blockade and a Toad House.

Layout
The course starts on a grassy hill with a pipe nearby, which leads to an underground section. This area has a Koopa Troopa. After the pipe, there is a clear pipe. This leads to a place with a Koopa Troopa, and a ? block. Under this is another cave like place. To the right is an area with some pipes, and an 1-up mushroom (in an invisible box). Goombas appear around here, as well as some more Koopa Troopas. After this, there is clouds. At the top, there is a straightaway, and a clear pipe. This leads the player to a golden pipe that has three golden shells. The other two entrences hold Goonbas. These are the areas you have to be in for the next clear pipe.

After that, there is a ? block. There is two invisible item boxes used to get to the top ledge. This has a Koopa Troopa, and a clear pipe leading to the stamp. Jumping up to the next ledge has an invisible ? block with a Super Star. You can use it to kill the Goomba Tower, and get the third green star. Afterwards, there is a wrap pipe to the goal pole. A Koopa Troopa is there.

Green Stars

 * Green Star 1: Right before the checkpoint, the first Green Star can easily be found between some levitating cloud platforms.
 * Green Star 2: The player needs to climb three purple blocks to find a purple Mystery Box. Inside, they must defeat two Koopa Troopas to reveal the second Green Star.
 * Green Star 3: Near the end of the level, players will find a Goomba Stack with the final Green Star in the middle of the stack.

Stamp

 * Just after the clear pipe to the last room, there is a rectangular question block. The player must get on top of it and jump to reveal a hidden rectangular ? Block. Jumping on top of that block reveals another, allowing them reaching a ledge. The player can then enter the Clear Pipe on the wall to warp into an enclosure below the ledge containing the Stamp and several Coin stacks.

Secret Warp

 * Cat Mario is required. Slightly to the right of the clear pipe leading to the stamp, Cat Mario must climb the wall to reach the ledge with an orange Warp Pipe. Once entering the pipe, the level will end automatically and Mario will travel through the pipe underneath World 1 and come out at the beginning of World 2.

Enemies

 * Koopa Troopas
 * Goombas
 * Micro-Goombas
 * Goomba Tower