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Following the block on the right will bring Mario to a small pipe. Located before the checkpoint and the first area with the Spike Pillars, there are two brown blocks which will move away to make way for Mario to pass through.
Mini Mario is required to access this secret exit. The player has to avoid the strong currents to reach it. Entering it will take Mario to another room with the Star Coin. The upper left one is green, which is of different colors of the rest of the pipes. Star Coin 3: After the checkpoint, there is a Red Ring surrounded by four pipes.The Star Coin is located above the second spiked wall on the right side of the area, guarded by a pair of Fishbones. Star Coin 2: In the main area, the player will navigate through several moving walls.There are also three moving walls that cover coins.
The Star Coin is above two ? Blocks above the water with a Fishbone. Instead of going through the Warp Pipe, Mario needs to swim into the hole and being careful not to swim too low.
Star Coin 1: At the beginning of the level, there is a hole on the left side wall in the water. Here the player needs to defeat four Reznors on a single wheel with four rectangular ? Blocks to clear the level. Warping through will lead Mario to a small area with a ? Block containing a Fire Flower and the boss door. More Fishbones and Spike Pillars will then appear, followed by a green pipe. After passing by another Fishbone, the walls close an area with a Red Ring surrounded by four current-producing pipes. Above the checkpoint enclosed in a safety zone, there is a ? Block containing a Fire Flower and a Brick Block that can be turned into a Gold Block. After the moving walls, Mario will approach Spike Pillars coming from both sides of the wall. Two Fishbones can first be found, followed by brown moving walls, which will move after a set period of time. After diving into the water, Mario will enter a green Warp Pipe on the right and upon reaching the following room, the level starts autoscrolling vertically. Two ? Blocks can first be found, with one of them containing a Fire Flower. Mario begins on a blue platform above the water with a single Fishbone.