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 Layer-Cake Desert level, 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 will unlock a shortcut to Soda Jungle.
All of the foreground is slippery ice. In some spots, Fire Piranha Plants are placed where they are able to melt the bottom part of the ice blocks, so the ice blocks can either fall on the player, or cause them to miss a jump and fall into the pit.
- Star Coin 1: Near the beginning of the course is a Warp Pipe. Reach it before the ice block blocks it to get the first Star Coin.
- Star Coin 2: Right before the first slope after the green ring, use fallen ice blocks to reach a Warp Pipe in the sky that leads to the second Star Coin.
- Star Coin 3: After a long series of floating ice blocks.
Names in Other Languages
||Patinaje entre Plantas Piraña
||Ice Skating between Piranha Plants
||Piranha-Pflanzen auf Eis
||Piranha Plants on Ice