Koopa Troopa Cave
From the Super Mario Wiki, the Mario encyclopedia
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, and it is unlocked by beating Super Bell Hill, and its completion unlocks Chargin' Chuck Blockade and a Toad House.
Koopa Troopa Cave additionally appears in the background in Super Mario Maker 2, in the underground theme of the Super Mario 3D World style.
The course starts on a grassy hill with a Koopa Troopa and a Warp Pipe nearby, which leads to an underground cavern filled with Koopas and Goombas. Near the beginning of this cave is a Clear Pipe that leads to a section with a Koopa Troopa and a ? Block. To the right is an area with some pipes and a hidden 1-Up Mushroom. Following this is an area full of cloudy platforms; at the top is a straightaway, and a Clear Pipe that leads to an area with three opening. One contains a golden Warp Pipe that has three Gold Shells; the other two contain Goombas. Past this section is a Warp Pipe that leads to an area full of Goombas, with a Star near the top, and a nearby Warp Pipe leading to the Goal Pole.
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