If the player goes to the level's normal exit, the player will find a Super Piranha Plant. Pressing the switch will cause the water level go up in order to reach the platform, or the red-flag exit that is located at the top.
The player will not be able to reach the big platform to the right, because they need to press a ? Switch first. In the left corner, he can find a ? Block with a coin inside, and to the left of the block is an Invisible Block containing a 1-Up Mushroom inside it. After crossing the puzzle, Mario will cross the midway point and then he will have to slide in order to proceed.