From the Super Mario Wiki
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Throughout the level, the characters have to navigate a system of Warp Pipes that mostly consist of Movable Pipes. With the help of the Mini Peach on the bottom floor, the player has to recruit the other two Minis, which start in precarious positions: the Mini Mario directly faces a Shy Guy, while the Mini DK similarly starts in front of a row of spikes that prevent it from progressing. The Mini Peach has to be lured into a pair of Hammers at the right and enter a Movable Pipe that leads it to the Shy Guy, destroying the enemy and recruiting the Mini Mario on the way. In a similar manner, the Minis have to use a Movable Pipe and a Long Spring at the top of the stage to bounce over to the Mini DK, forcing it to go in the opposite direction from the spikes and safely enter a red pipe. After traversing some more pipes, the Minis should reach a Long Spring that bounces them towards the Goal Door.
The M Coin is located in the center of the stage, next to two adjacent Movable Pipe outlines placed one above the other. To collect the coin, the player should turn both pipes solid so that the Minis enter the bottom one and exit from the other without falling onto the spikes beneath.
The following data applies in both the Nintendo 3DS and the Wii U versions of the game.