Tilted Tunnel

Tilted Tunnel, or Acorn Plains-2, is the second course of Acorn Plains in New Super Mario Bros. U. It is an underground course with slanted pipes and shifting crystals. It is the first course to have the Fire Flower. After this level is completed, a cutscene will show the flags on Peach's Castle being replaced by Bowser's flags.

Layout
The course is filled with slanted pipes, which Piranha Plants come out of, and shifting crystals, which move when the player gets to a specific point. Later in the course, there is a long pathway where the player can slide into Goombas to gain 1-Ups.

Enemies

 * Koopa Troopas
 * Goombas
 * Piranha Plants
 * Buzzy Beetles