From the Super Mario Wiki
Switchboard Falls, otherwise known as World 3-7, is the seventh course of World 3 in Super Mario 3D World. It is unlocked via completion of Pipeline Lagoon, and its own completion unlocks The Bullet Bill Express.
The level starts with the player on a Switchboard which leads to an area with another one and a Switch Block, which when hit changes the direction of the tracks and allows the player to move on to the next area. Here, the player must hit the Switch Block and avoid the nearby Fuzzler in order to move on to an area with some Fizzlits and the Checkpoint Flag. A nearby Switchboard network leads the player to an area behind the waterfall where they need to hop on another Switchboard and pass another Switch Block network infested by Fuzzlers. After passing this area, the player reaches the Goal Pole.
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