This level features Donut Blocks, Pipes, Color Switches (that only affect Polterguys) and a Yellow Spring. The leftmost Mini must timely use the Blue Color Switch to freeze the blue Polterguys above to make a path to the top of the level near the Gold Mini Mario, while the rightmost Mini must use the nearby Pipe to the left to get to where the Gold Mini Mario is. From there, the Minis must reactivate the Polterguys and freeze them in another formation to gain access to the Goal Door in the top-left corner.
Mini Mario Card
The "R" Mini Mario Card is in the top-right corner of the level, next to a Pipe. A Mini must enter the rightmost Pipe to reach the card, or can alternatively freeze the red Polterguys to the left of the card using the Color Switch below them to make a bridge to the card.