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Mushroom Heights, or Acorn Plains-4, is the fourth level of Acorn Plains in New Super Mario Bros. U. It is the first athletic course, and the first course to introduce Goombrats and Balloon Baby Yoshi (although the same Baby Yoshi can be acquired just before Mushroom Heights on the world map). This is the first course of the Acrobat Pack in Boost Rush. This course is unlocked by completing Yoshi Hill, and this course in turn unlocks Lemmy's Swingback Castle upon completion.
The course comprises of moving Mushroom Platforms, such as ones that move up and down, or ones that tilt forward and backward. The level begins near some Mushroom Platforms moving up and down, along with two Piranha Plants, a ? Block containing a power-up, and a Goombrat. Some stationary Mushroom Platforms follow, along with some more Goombrats and a tilting Mushroom Platform. Three more tilting Mushroom Platforms are found above a pit, with Goombrats on them. Some platforms moving up and down are found, with a Piranha Plant and two Big Piranha Plants. The Checkpoint Flag follows. More Mushroom Platforms moving up and down are found, along with Goombrats. A group of four platforms moving up and down are found with a Koopa Troopa and two Piranha Plants on them. A section of tilting Mushroom Platforms are found with Big Piranha Plants in between, with the Goal Pole at the end.
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