From the Super Mario Wiki, the Mario encyclopedia
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The course is a complex of conveyors, Blue Lift Rivets and Red Girder Rivets disposed in various positions and heights. There is a Capture Kong at the top of the stage which initially grabs and captures a Mini Mario. The three Mini Paulines start on different platforms along the left side of the stage. Several narrow passages in the center of the course lead to the Goal Door, but the player is required to build a Red Girder under the door in order to enter it. However, before this, the Minis should use a nearby pair of Hammers to stun the Capture Kong and free any toys captured by it.
The M Coin is located on a short conveyor at the far left. To collect the coin, the Minis should fall onto it from the larger conveyor above.