From the Super Mario Wiki, the Mario encyclopedia
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The course features four Mini Donkey Kongs. It is one of the three courses (aside from Room R-7 and Room R-8) that need to be completed in order to unlock the option to replace the minis in most courses with Mini Donkey Kongs.
All minis start on the left side of the course on different platforms. The Goal Door is located in the top right corner of the course. In order to reach it, the Mini Donkey Kongs have to be guided via a series of Pink Blocks, Magnets and Magnet Rods to it.
With regard to the course's layout, the left and right sides of this course are inverted and separated by Magnet Rods.
Mini Mario Card
The Mini Mario Card is located atop a platform in the top right portion of the course. To reach and collect it, the minis can follow one of the Magnets that lead to the card.