Level 6-2 (Mario vs. Donkey Kong: Tipping Stars)
From the Super Mario Wiki
The layout of this course is wide and contains a large number of Pink Block spaces that are arranged to enable movement between platforms and over spiked floor. Several Long Springs are also present, along with a few Color Switches. The Mini Mario starts at the far left, while the other Minis start one above the other, further right from Mini Mario's position. The Goal Door is found at the far right and can be reached by enabling the span of Blue Color Blocks behind it, then jumping from a nearby Long Spring.
The M Coin is located at the top of some steps with Long Spring slots. To collect it, the Minis should jump on these springs.