Hot Cogs, or Peach's Castle-3, is the third course of Peach's Castle in New Super Luigi U. It is unlocked from completing Magmaw River Cruise and its own completion unlocks Current Event. Its name is a pun on "hot dogs".
The player starts in a lava cave with a gear turning clockwise, and a Lava Bubble is jumping around the gear. A ? Block containing a power-up is found, and is followed by another gear and Lava Bubble. A section of the ground is found, and a Goombrat is found on it. Another Goombrat is found, along with a row of Lava Bubbles below a row of Brick Blocks with a Red Ring above them. Another section of gears follows, with more sideways-jumping Lava Bubbles found. Another section of the ground follows, along with a Goombrat and some Lava Bubbles. Six more gears and some Lava Bubbles are found in the section leading to the Goal Pole.
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