From the Super Mario Wiki
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The level features three Mini Marios, though not necessarily in the same starting positions.
Two Mini Marios begin at the bottom left while the other begins at the middle right, with the exit door near the bottom center. In order to reach it, they must simply be guided via a series of Cannons and Blue Ladders to it, while avoiding Fires and the Piranha Plant.
The M-Token is located at the bottom right, in an alcove to the right of the exit door. To collect it, a Mini Mario must simply drop down from the nearby Blue Ladder while heading right.
Mini Mario Card
The Mini Mario Card is located near the very center, to the right of the Piranha Plant and to the left of a Fire. A Mini Mario must use the Cannon at the top left in order to reach it, which will allow it to use Hammers to take out the Fire.
In order to earn a trophy, the player must score 15400 points.
In order to earn a trophy, the player must score 14800 points.