Piranha Plants on Ice
From the Super Mario Wiki
Piranha Plants on Ice, or Layer-Cake Desert-, is a secret course hidden in Layer-Cake Desert of New Super Mario Bros. U. Although this is a level in Layer-Cake Desert, the course is actually situated on a block of ice in Frosted Glacier to the right of the cake structure. To reveal this level, the player must locate the secret exit in Spike's Spouting Sands. Finishing this level unlocks a shortcut to Soda Jungle, skipping Frosted Glacier and Sparkling Waters.
The level begins near a segment where a row of Fire Piranha Plants are found below slippery platforms, where they can melt Frozen Coins to make ice blocks fall. ? Blocks are found above the platform. Afterward, the player must cross a section of the level with a Koopa Troopa, as well as Fire Piranha Plants that cause ice blocks to fall from above. The Koopa Troopa can be used to obtain a 1-Up Mushroom from a Brick Block. A Green Ring is then found, with the Green Coins appearing around Fire Piranha Plants and more falling ice blocks. The player must cross over a row of ice blocks that Fire Piranha Plants below can make fall, followed by more ice blocks that fall from above, some of which having Koopa Troopas on them. After two more Fire Piranha Plants, the Goal Pole is found.
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