Firefall Cliffs, or Peach's Castle-4, is the secret fourth course of Peach's Castle in New Super Mario Bros. U. It is unlocked via the secret exit of Meteor Moat, and its own completion unlocks Red-Hot Elevator Ride.
This course is an autoscrolling course that involves climbing walls and dodging meteors. The level begins near a Koopa Troopa, as well as a climbing wall with Meteors that fall above it. Some pits of lava are found, along with more Meteors. Hard Blocks that can be destroyed by the Meteors are found above sections of the lava, with a POW Block on one of them. Another climbing wall is found, along with a ? Block containing a Super Star. A section of Meteors is found leading up to the Checkpoint Flag. The section of the level following the Checkpoint Flag autoscrolls upwards, and the player climbs up using platforms and climbing walls. More Meteors act as obstacles throughout the section. More lava pits are found, with a Green Ring located above one of them. More Hard Blocks are found, along with a Brick Block containing a 1-Up Mushroom. A vertical section containing climbing walls and Meteors is found leading to a Warp Pipe. The Goal Pole is then found.
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