From the Super Mario Wiki
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Several Red Girder Rivets and Blue Lift Rivets are fixed throughout the course, making it possible to move from one platform to another by connecting them. There are also several Pokeys patrolling different areas. The enemies must be lured onto Red Girders and dropped into other areas to allow the Minis to surpass them.
The Mini Mario and Mini Toad both start inside a recess on the left, facing a Pokey. The enemy should be moved away from the toys by leading it with a Red Girder to a higher level. The Mini Pauline starts in the top right corner, also near a Pokey. The player should lure the enemy on a short Red Girder, then remove it right under its body and cause the enemy to fall beneath, making way for the Mini Pauline. All Minis should head for the Goal Door on the far left side, located on a span of ground right above the Mini Mario's and the Mini Toad's initial positions.
The M Coin is floating right under the platform where the Mini Pauline starts. The Mini Pauline toy should first fall through the gap in front of it and reach the bottom floor. Going straight ahead, the toy encounters a steep slope where it will change direction. From there on, the toy should climb the following Blue Lifts and reach the top where it will go back towards the starting position. However, where the gap is, the player has to draw a path of Red Girders that leads to the M Coin.