Icicle Caverns, or Frosted Glacier-5, is the fifth level of Frosted Glacier in New Super Mario Bros. U. It is unlocked via completion of Prickly Goombas! alongside Scaling the Mountainside. Its own completion opens the path to Swaying Ghost House. It is also the only level with Ice Bros.
The level begins above ground, with a Huge Icicle that is used to reach a Warp Pipe leading to an underground area. A row of icicles is found through the Warp Pipe, along with a Buzzy Beetle and a lift with a ? Block containing a power-up over it. A slope with Buzzy Beetles is found, as well as more icicles. More lifts are found above a pit, and a row of Brick Blocks allows hidden coins to be reached. A Huge Icicle is found, along with some more icicles and a Red Ring above a lift. A section with more lifts, icicles, and Huge Icicles follows. Some Buzzy Beetles are found, along with the Checkpoint Flag. More lifts are found, followed by an Ice Bro on a row of Brick Blocks. Another section with lifts and icicles follows. Another Ice Bro and more Huge Icicles are encountered. A Warp Pipe is found at the end of the area, leading to the Goal Pole.
At the beginning of the level, just before the pipe, when the giant icicle falls, the player can use a P-Acorn or a Balloon Baby Yoshi to fly or float to reach a platform above the area. The player can continue to the right, where a group of coins is found. At the end of the section, the area with the Goal Pole is found, and the platform with the third Star Coin can be reached.
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